This guide is mostly an item list of damaged items, so a walkthrough in air quotes. I will mention how to do more involved tasks like radio tuning or spitfire rearming the first time they happen, but only the first time. If you progressed past this, you already know how it's done and repeating is of no help.
Obvious busy work like refueling or oil changing I will skip after the first one.

As for orientation, right/left side of the plane is always meant as if you sat in the cockpit. And for parts, like "the 4th piston", it's always looking straight at the part/assembly, left to right.

If you remove whole assemblies, they're placed behind the plane where they're easier to work with.

You may notice me getting a bit annoyed at the game around middle of the Blenheim. You'll have to excuse me. You will understand why once you reach that part. Radial engines plus no assembly removal equals despair.

If you read this on any site except for steam, that site steals guides and should not be used

While removing or adding parts, you can right click after you selected all screws and add/remove a different part. Those screws then are queued. This can make complex removing/adding maneuvers much faster.
Enough speed lets you clip through the solids. Select something, turn the camera far to the other side and then just hold the direction key and if you got fast enough, you will just clip through whatever object and be able to see the engine or whatever from the other side. Probably not much use to you, with this guide, but it was useful to me.
You need to remove hoses etc, but you do not need to lower the plane or move the oil service out of the way to get a perfect score.
You hardly ever need a ladder. In fact, save for refilling coolant for the mosquito, you never need a ladder because it can be accessed by the wings.
Stop playing as soon as you reach the Blenheim. If you keep playing, you'll find out why I would say such a thing soon enough.

Fix the problems with engine power
This is the tutorial, so in game tips tell you what to do. I do too, a bit more verbose than I usually will down below.
Switch to the disassembly mode (1 on keyboard) and open the engine cowling on the right side of the plane. Go to inspect mode (3 on keyboard) and look if you can find the problem by inspecting the parts you can see. Especially the carburetor. Go back to disassembly mode and remove the carburetor. If you try to, you see the air intake light up in red. This means you have to remove that one first. Do so.
Once you removed it, you can go to the workbench and oil the little orange dots. There are usually 4 of them, one click to select a spot, then click and hold until it's in the green. I will not mention that again leater as well. Just go to the workbench before going to the resupply truck to see if you have something that can be fixed.
Now back to the plane, enter assembly mode (2 on keyboard) and reinstall the fixed carburetor and the valve, and while still in assembly mode, close and secure the cowling again.
Refuel the aircraft
Interact with fuel service and choose "Refill the fuel 1", then wait a bit while the ghosts guide the hose to the tank, then interact again, "Refill the fuel" and turn the handle. Feel free to go full blast, you can't overfill. Go back with right click (will automatically stop the fuel if you didn't do it manually), interact again and pull out the hose.
Every refueling is like that, except later on, there are more tanks, so I won't mention that again.
If you selected expert mode, well you made a mistake because oh boy, the busy work you burdened yourself with, but then you have to insert the hose into the tank manually.
Now you're done, hit ESC and sign the work sheet.
I will not be mentioning all this later on, as it's a core part of the game mechanics, and, really, learned after this or the next mission. I will just be mentioning the defective parts so you don't miss them or if you can't find them.

Replace the wheels
To replace the wheels you have to grab the lift service right of the plane and place it below the front of the plane. Then use it again and raise it.
Take off both wheels. This time you can't repair them, so go to the truck, select them in the list and hit "replace parts". The damaged wheels in your inventory will be automatically and instantly replaced with the fixed ones, which you can install again.
You don't need to lower the plane or remove the lift service at the end.

Refill the oil
This is done exactly like refilling the fuel with two differences: Once you select a tank to fill, the oil service will be teleported there. And while filling, this time you can overfill, which will deduct points at the end, so be careful. Pretty easy not to overfill the tiger moth, later planes have way less distance between min and max.
You don't need to put it away at the end, just pull out the hose is enough.
And as with refueling, I will not mention this again.

Fix the problem with the oil system
The pressure filter and the oil filter (back of the engine) are damaged.

Fix the propeller
The airscrew hub just behind the propeller got some issues.

Check the undercarriage
Replace the tailskid and both wheels. The tail also has to be raised by the rack.

Check all spark plugs
The second spark plug on the right side is busted.

It pretty much tells you exactly what to replace. I won't mention such jobs again.

The oil filter is fine but in addition to the fuel filter, the pressure filter is also in need of service. Which means you have to remove the oil filter anyway :D

Check pistons and rings
First time you open the engine! Remove all the cylinder assemblies. How to remove whole assemblies is something the in game tips tell you, but in short, if you long-click on something marked with "assembly" you'll remove the whole assembly, a short (normal) click means you select the assembly and can remove parts of it (right click to deselect). As of now, you'll want to remove the whole cylinder assemblies, or at least the first and last one. This leaves just the pistons which we want.
Removed assemblies are placed on the stools behind the plane, where you can work on them separately. Not much sense to do that with the moth but it comes in handy with later planes.
The items to replace are: the frontal piston and all its rings, and all the rings on the piston on the other end.

Fix the problem with left side ignition system
The left magneto is damaged.

Replace all worn parts in the engine
The worn parts are:

• Right side ignition wires
  
• Second-front spark plug on the right side
  
• Front spark plug on the left side
  
• Second-innermost spark plug on the left side
  
• One of the valves (right side of the plane) of the front-most cylinder
  
• The right-most (closest to the plane) push rod. Those are the rods poking out of the the tube coming from the engine block on the left side of the plane. This was the first one I had to google and part of the reason you read this right now :) To remove this rod, you gotta remove the camshaft first. Look at the front of the engine block for the camshaft cap, remove it and pull out the camshaft.

Don't forget to insert the camshaft and it's cap again at the end, really easy to miss and then you wonder why you can't reassemble the plane.

Check the undercarriage
Left front wheel, right compression leg and the tailskid need your magic.

Patch all bullet holes
2 on the left wing, 1 on the right wing. You need to "disassemble" (clean) the holes first. For laer planes, tjis is only needed for exit holes.

Inspect whole aircraft
Damaged parts are:

• Both compression legs
  
• Right wheel
  
• Fuel filter
  
• Rocker mechanism of the front cylinder
  
• Middle ring of the furthest-inward piston
  
• Head gasket of the second-to-front cylinder (this one is evil. You need to strip the cylinder down until only the barrel is left, it's the ring inside the barrel)

Fix the problem with engine power
It's the fuel filter, and the second spark plug on the left side as well as the leftmost spark plug on the right side.

Fix the problem with engine power
The front pushrod of all but the front-most cylinders need replacing.

Check the undercarriage
Right wheel and tailskid

Inspect the whole aircraft
Damaged parts:

• Timing gears unit
  
• Rightmost spark plug on the left
  
• Piston rod of the hindmost piston
  
• Lowest piston ring on the furthest out piston
  
• Valve on the front-est and third from the front cylinder head
  
• Rocker mechanism on the same two cylinders (note, I'm not positive my game didn't have a bug here, it behaved suspiciously. The cylinder may be wrong, the rocker mechanism may also be of the second-to-front cylinder. Best check every rocker mechanism and valve)
  
• Head gasket (that sneaky ring inside the barrel) on the second-to-front cylinder

Refill coolant
Access door to the coolant is top left of plane, right behind propeller.
Open access door/remove cap before taking the refill container.
Refilling (and opening door/cap) can be done from the wing if you're careful, no need for the ladder.
Every refilling of coolant is the same, so I will only mention the access door location for later planes.

Fix Engine knocking sounds:
1 valve on left side (under port rocker cover)

Check all spark plugs
At the sides and in the middle under induction manifolds.
Bad ones: Second and last one on the right side
Possibly it's enough to only replace the two bad ones and not check every single one

Check pistons and rings
From the top of the plane, remove the cylinder block assembly as a whole to get to the pistons.
Problematic items:

• All rings on the second piston cylinder on the left
  
• Third piston cylinder on the left
  
• Middle ring of rightmost piston cylinder on the right

Fix the problem with the guns not firing
The guns are in the wings.
One of the guns and one of the ammo boxes on the right side of the plane have issues

Rearm machine guns
Replace all the ammo boxes.
After that, open the gun covers above the wings, open the breach cover and put in the ammo belt (assembly mode).
Funnily enough we didn't have to do that on the last task, despite replacing an ammo box
Replace all gunport patches
The stickers on the front of the wings. just take off and attach again, no need to order new ones, you have an infinite supply with you.

Setup the radio
The radio hatch is on the left side of the plane behind the cockpit.
To tune: turn transmitter frequency wheel until Signal gauge hits max. If you hit the right spot, it goes to tuning.
Turn the two knobs until you hear a clear morse code. This is very finicky. The correct area of the frequency knob is like a pixel wide. You can go past the correct area several times without even hearing a single beep.
I don't know if it's random but if not: Turn the tuning wheel all the way clockwise, that was the best tuning for me, then search in the frequency area where you hear someone talking, and just turn the knob ever so slightly. You only hear the morse when you're already a pixel or two away from the correct position.
If it is indeed random, well, good luck. turn the frequency knob very slowly, if you can't find any morse at all, adjust the tuning quite a bit (that knob is not quite as sensitive) and try again.

Patch all bullet holes
10 holes in the left wing, 5 entry holes (on top of the wing) and 5 exit holes (bottom of the wing). The exit holes need to be cleaned in disassembly mode first, then patch all in assembly mode.
Replace gun camera tape
Access hatch to the camera is on top of the left wing, on the front right by the body

Fix the problem with taxing
Throw the tea into the har... err. Take off the right wheel to find 3 damaged brake pads

Patch all bullet holes
7 entry holes in the left side of the tail. No exit holes

Wait with the gunport patches and rearming until after harmonizing.
Fix machine gun
The broken gun is one of the middle ones on the left side
Patch bullet holes
7 holes in the right wing, 4 entry holes on top, 3 entry holes on the bottom.
Harmonize the guns
Do this after fixing the gun.
The in-game tips explain it well enough, but just in case:
Raise the tail of the plane with those tall metal legs. Go to the harmonization board (near the truck) and install it. Do the following for every gun: Open the breach and place the harmonization unit in it (if you already fed the belt through rearming, just remove the belt again in deconstruction mode). If you only see red, you already replaced the gunport patches, I'm afraid you have to remove them again. Now on the top left one of the targets is glowing (the leftmost was outside of the screen for me). Use mouse and WASD to find that target and ensure it's directly in the middle of the viewing circle. The game doesn't make it easy, seeing as the movement keys move it so quickly. Once you're correctly lined up, you'll leave harmonizing view automatically. So if that doesn't happen, you're not correctly aligned.
Hint: The movement speed seems framerate related. It is easier is you set Vsync to ON in the options to ensure the game runs at the target frame rate and not whatever your machine can deliver.
I haven't tried it but I suppose lowering the frame rate on top of that would probably also help, but this can only be done in the main menu.

Replace all worn parts in the engine
The parts are:

• Port (left) magneto
  
• Engine starter
  
• Fuel pump
  
• 2 Spark plugs (1 on the left side, 1 on the right side, none in the middle)
  
• 3 Valves (2 on the left cylinder head, 1 on the right one)
  
• 1 piston cylinder (4th one on the right side)
  
• 1 piston ring (middle ring on the 5th piston on the left)
  
• Port (left) head gasket - in the cylinder block assembly, below the cylinder head with all the valves

Setup Radio (see order 03259)
This time, turn the tuning knob all the way counter clockwise to start. The actual target position is a teeny tiny bit clockwise from there, but find the morse code first before tuning.
Harmonize guns (see order 03289)
Remove ammo belt first

Fix propeller pitch
Screw off the nose to get at the distributor valve behind it, which is damaged.
Take of the propeller, too, to get at the damaged pitch governor

Check tail wheel
It's literally just the wheel

Fix oil filter
Again, just the oil filter

Fix the gun problem
It's the air compressor in the engine bay, as the guns are fired by hydraulics
Patch bullet holes
15 holes. 3 entry holes on top of left wing, 4 on top of right wing. 5 entry holes on left side of the tail, 3 entry holes on the right side of the tail. No exit holes.

Fix problem with engine power
The problem is the starboard (right) magneto
Patch bullet holes
18 holes. 7 entry holes on top of left wing, and their 7 exit holes on the bottom. 2 entry holes on the left side of the tail, 2 exit holes on the bottom of it.

Setup the radio
Tuning knob clockwise all the way this time

Check pistons and rings
4th piston cylinder on the left and all 3 of its rings.
On the right side: Top ring of first piston, bottom ring of second, top ring of third.
Patch bullet holes
12 holes. 6 entry holes on the left side of the tail, and their 6 exit holes on the right side.

Patch all bullet holes
12 holes. 7 entry holes on the left side of the plane, 2 on top of it. 3 exit holes on the bottom (go prone with the Z key).
Set up the radio
Turn tuning completely clockwise

Check the Engine for damaged parts
The only thing damaged is hard to find, it's the port (left) head gasket - the metal sheet between cylinder block and cylinder head
Patch all bullet holes
23 holes. 11 entry holes on top of left wing, 4 exit holes on the bottom of it. 5 entry holes on the top of the right wing, 3 exit holes on the bottom of it.

Patch all bullet holes
8 holes. 6 entry holes on the left side of the tail and 2 on its right side.

Fix the electric system
Suppressor and generator on the left side of the engine.
On the right side of the tail, where the big white S is, there is an access hatch you never used before. Behind it is a broken battery.

Replace the damaged radiator
It is under the right wing
Check the engine for damaged parts
2 valves in the starboard (right) cylinder head are busted

Fix the hydraulics
Just the hydraulic pump

Patch all bullet holes
24 holes: 12 entry holes below left wing and their 12 exit holes on the top

Check the ignition system
1 spark plug on the left, 1 spark plug in the middle on the port (left) side

Check the oil filter
Exactly that, replace oil filter

All as usual, just that now you gotta have to fill multiple tanks.
The coolant access door is right behind the propellers, on top. This time, you sadly do need the ladder.

Fix the problem with the oil temperature
The oil radiator between engine and cockpit is busted

Check the undercarriage
The right wheel and the hind wheel are busted

Fix the problem with flames from right engine
Right engine, left cylinder head has 2 broken valves

Fix the problem with coolant temperature
Coolant radiator between right engine and cockpit needs replacing.
On the underside of the left engine is a damaged hydraulic pump.

Check the oil filters
The oil filter of the left engine needs fixing. The oil filters on the mosquito aren't actually in the engine, instead, go prone (z key) and crawl under the hatch the wheel comes out of, the oil filter (and tank) is in the wheel well there.

Check pistons and rings
Left engine, left side: 4th piston cylinder and all its wings
Left engine, right side: All 3 rings on the second piston cylinder
Right engine, left side: All 3 rings on the second piston cylinder.
Right engine, right side: the last piston cylinder and all its rings.

Fix the right engine
Damaged parts are left and right magneto as well as the wheelcase

Load bombs
This is simple. You start with having them in your inventory. Yes, you casually carry 2000lbs of bombs in your back pocket. Just open both bomb doors and install them in assembly mode.
If the task is not checked for you.. Neither was it for me, seems to be a known bug. Just eat the loss of points.
In the next Task you do the same again and then it's checked. You didn't forget anything.

Load Bombs
This time it works..
Fix electric system
Generator on the left side of the left engine needs replacing or fixing.

Check the Undercarriage
Replace both front wheels

Fix the problem with bomb bay doors
You start with 2 doors in the inventory. Ignore them, basically another bug or forgotten addition for an early iteration of this Task. The issue is the (upper) hydraulic pump in both engines, nothing with the doors.

Replace oil/fuel filters
The fuel filter on top of left engine and the oil filter in the wheel well of the right wing need replacing

Inspect both engines
Left engine:

• Left cylinder block:
  
  • Bottom ring of second piston cylinder
    
• Right cylinder block:
  
  • Right head gasket
    
  • Bottom ring of first piston cylinder
    
  • Top ring of fifth piston cylinder
    

Right engine:

• Left cylinder block:
  
  • 4th spark plug on the left side
    
• Right cylinder block:
  
  • 5th spark plug on the left side (middle-right if inside engine bay)
    
  • One of the valves
    
  • Middle ring of 4th piston cylinder
    
  • Middle ring of last piston cylinder
    

Fix the left engine
Supercharger is the only thing damaged

Fix the problem with oil pressure
Oil control valve on the right side of the left engine

Restore the aircraft to pristine conditions
Oil filter in left wheel well
Left engine:

• Right magneto
  
• Propeller shaft
  
• Left cylinder block:
  
  • 2 valves
    
  • 6th piston cylinder
    
  • Middle ring on the 3rd piston cylinder
    
  • Top ring of the 5th piston cylinder
    
• Right cylinder block:
  
  • 2 valves
    
  • Right coolant outlet pipe
    
  • 5th spark plug on the left side (middle-right if inside engine bay)
    

Right engine:

• Left cylinder block:
  
  • Left rocker mechanism
    
  • 3 valves
    
  • Middle ring on first piston cylinder
    
  • Lower ring on second piston cylinder
    
• Right cylinder block:
  
  • 1 valve
    
  • 2nd spark plug on the left side (middle-right if inside engine bay)
    
  • 3rd piston cylinder
    

Refill coolant
This time it's behind the engine on the right side. And you can reach it by the wing again.

The radio is on the left side below the cockpit. The wind screen is actually just the cockpit door. The rest is spelled out for you.

Replace oxygen tank
It's in the radio compartment
Repair the compressor
Attached to right cylinder head

Fix the propeller
Nearly every single propeller part is damaged (in inventory: spinner, 7 times blade assembly, propeller dome, front plate)

The plane stops very slowly
Every single brake pad on both front wheels is no good no more.

Check all spark plugs
The only faulty spark plugs are on the right cylinder head. Second on the left of it (so middle-right), first, 4th and 6th on the right side.

Fix the problem with the guns
This time it's not the hydraulic pump. It's every single gun.

Oil Valve not working
What it says on the tin. It's below the right cylinder block.
Exhaust noises
All 3 exhausts on the left side bit the rust.

Replace the coolant drain line
The left coolant outlet pipe (the big pipe above the left cylinder block) needs replacing.
Fix the propeller
One of the propeller blades (bottom right when looking head on) is busted.

"Transmission housing" is the wheelcase attached to the supercharger

Both wheels and brake pads. Will not be mentioning "stops slowly" missions again unless it's something other than brake pads.

Be prepared for the worst plane of them all, at least until the next one lol. The plane where I would have stopped playing if I didn't write a guide.
You now have a radial engine, meaning 9 cylinders arranged in a circle. You can't remove the cylinders as assemblies. If you need to get at something behind them, you gotta remove every single spark plug, valve, rod, pipe, rocker or every single cylinder, manually. Which is the exact reason this plane and the next one are simply no fun. Consider yourself warned, I'd recommend stopping now and maybe replaying the previous planes.

Because of the radial nature of the Blenheims engine, I refer to the parts of it as if viewed head on, clockwise with 1 at the top.



Oh, something different. Repair the oil service, two lift services and the ladder.
And, well, install the propeller.

Don't forget the down facing windows.

Fix propellers
Problem is the cam sleeve of the right propeller.

Repair the problem starting the left engine
It's the forward cam follower rod at the cylinder #1, #2 and #3. To remove the front cover, you just have to remove the propellers, not the whole propeller assembly.
Fix the noise from the right engine
Problem is the bearing behind the propeller assembly.

Repair the problem with starting the left engine
Replace the spark plug on the left of the the top cylinder (#1) and both spark plugs of cylinder #4.

Repair the damaged gun
The gun in the left wing, not the turret.
Repair the overheating right engine
Each one of the cylinders #2, #6 and #9 has a broken air intake pipe.

Repair left engine
The crankshaft is broken. You have to take apart the whole engine to reach it. All rods, all spark plugs, all valves, all pistons... Did I mention that this time you can't take out whole assemblies? Or that you have to take the valves out before the rockers which makes no sense and makes them hard to click on? Yeah.. have fun.
Keep in mind there are two parts to the crankshaft. You can reach one part without taking out all cylinders, but both parts are broken.

Replace gun
This time it's the turret one
Repair the damaged right motor
It's the front cam ring. At least this time you don't have to take everything apart, but you still gotta remove all the follower rods and valves again. just not the spark plugs or pistons.

Check Condition of right engine
It's the propeller reduction drive a bit behind the propeller. I was half expecting it to be the drive shaft again..
Fix the problem with the (left) rotor's rotation
Actually that's the "does not start" from the description. The rotor not turning is the one above.
The spark plug cables of the cylinders #3 and #5 need replacing.

Fix the problem with the white smoke from the right engine
A valve of cylinder #1 (back right) and the one of cylinder #5 (front right) is kaput

Repair brakes
2 brake pads of the right wheel. Only one of the two lifts works on the right wheel.
Improve the stability of the right rotor
The thingy the blades are slotted into (just called "propeller" in game) is the bad apple.

Fix the noise from the right engine
It's the propeller bearing again. We replaced that part already back in 08129, damnit!
Improve the stability of the left rotor
Propeller screw is busted. Or at least one of the things labeled as such.

Repair overheating right engine
The piston cap and piston rod of multiple cylinders are busted. So.. out go the valves yet again. The cylinders are #9, #1, #2, #3, #4. On cylinder #1, only the piston rod is damaged, for the rest, both rod and cap.
Don't forget to put in the rod pin and piston cap pin again or you may have to undo/redo plenty of work.

Repair the electronics of the left motor
The cylinder #6 has two outer spark plug cables and two spark plugs that do not sparkle

Fix the problem with the white smoke from the left engine
The cylinders are to blame this time, namely #6 and #9. But.. also the cylinder head below both of them, and the piston rod of #6. And because you can't get at that without removing the engine cover.. You have to disassemble loads. Again.
The one plane where the "remove assembly" function would have been most useful doesn't have it. The one plane where the "remove piston pin/rod pin automatically" would be useful doesn't have it. The one plane where manually turning the propeller would actually be of any use so you could get the piston up without removing the cover.. doesn't have it. Really, game?

Repair the stopped right motor
The master rod (the rod of piston/cylinder #1) is damaged.
So you have to disassemble pretty much everything again.
At least you can let the other cylinders/pistons in there because this time you have to remove the rod pins manually so you can remove all other pins, right? Hahaha, no. Out with all of them.
Remove the power loss problem in the left engine
It's two of the valves of cylinder #4 and another two of cylinder #9.
Another damaged item that I found by chance through clipping through the hull that is NOT needed to tick this objective but IS needed to get perfect score is both parts of the crankshaft, for which you'd have to disassemble the complete engine. I chose not to do that, resulting in "the aircraft flew with reduced performance" at the end. Perhaps you can not do this and not get reduced score if you didn't examine the part.
Repair the pitot tube
The pitot tube is the white thingamabob hanging under the cockpit below the left lower window.

Check the condition of the right engine
Replace the rockerbox on cylinders #9 and #3

Check the condition of the exhaust in the left engine
The right exhaust on cylinders #9, #2 and #7. Or rather, just postpone that, because you will take everything apart for the second objective anyway.
Repair the turbocharger of the left engine
Yes. That's the deepest part of the engine. Behind literally everything else.
I'm becoming convinced the bad reviews of this game is just because the Blenheim (and Wellington). This is torture.

Finally done with that damn Blenheim. Let's see if Wellington is as bad.
Hint: It's worse. Think Blenheim but the follower rods and the rocker boxes have an additional cover over it.
Well isn't this guide a perfect example of the sunk cost fallacy? I already got so far, I can't stop now!

Note of the parts of the Wellington can ever be repaired.

As with Blenheim, engines are labeled 1-9 starting from the top, clockwise.


Check the condition of the outer part of the right engine
The propeller and the engine front cover

Repair the problem with starting the left engine
2 spark plugs in the cylinders #2 and #5.

Repair the stopped right motor
It's the front crank shaft. Don't be deceived by "front", you still have to take everything apart.
And just like with the Blenheim, you can't take the cylinders off without unscrewing every pipe and removing every valve and spark plug. It's not like they had a "take whole part off" earlier in the game or anything..
The most tragic part of it is that behind the plane, there's clearly 8 places for the removed cylinders to go. It was planned at one time, they just never bothered to implement it.

Check the condition of the right engine charging circuit
It's the supercharger. Yes, the thingy behind everything else. Also two of the air inlet pipes - but that can be ignored as you take off everything anyway, again. The task will just not be completed until you attach the air inlet pipes as well.

It's 3 brake pads of the left wheel. The loop antenna is the tear shaped thingy above the cockpit.

Repair the windscreen
it's the cockpit glass
Check the condition of the left engine
The piston cap of the piston #9 and the cap and rod of the one on #2 are damaged. Also the back cam follower rod of piston #2, but just like last time.. You guessed it. Everything has to go again, so you'll have to remove every cam follower rod anyway, the task is only ticked off once you installed the rods. Isn't this plane so much fun? Are you not entertained?

Repair the wheel
The wheel is the left one. Despite clearly hanging in the air, you still have to jack up the plane to take it off.
Fix the problem with noise from the right engine
The bearing behind the pistons needs replacing. Yes, you guessed right.

Investigate the cause of the right engine stalling
Rear cam ring is the perpetrator. Yes. The one in the rear. Well it's in front of the pistons, but still behind the crank case so you still have to remove all cylinders yet again.
Why do you even still read this? Why do you still play? I have a guide to finish, what is your excuse?

Repair worn pistons.
...
Left engine. Piston heads #1, #5, #8, #9.

Both tasks are in the left engine.
Rejoice, for once you don't have to take everything apart.
Check cylinders for leaks
Cylinder #2 and #7 need replacing for the first task.
Repair the problem with the engine cutting in and out
It's the hind cam follower bolt at #9

The guns at the very front and very back of the plane. They work the same as the turret in the Blenheim.

The astrodome is, fittingly, the glass dome on top of the plane.

Repair the suspension
not actually any suspension, but all parts of the right wheel except the brake pads.
Repair tools
The lift service on the right of the plane.
Repair electronics
Right engine.
It's the spark plug cables (also labeled just "spark plug" but the small cables attaching to the spark plugs) of #2, #4 and #5

Improve stability of the left rotor.
The propeller screw needs replacing. Multiple things are labeled like that, it's the one inside/behind the propeller.
Repair pilot tube
The pilot tube is not the tube where the pilot sits but the attachment under the right wing.
Repair the damaged brakes
Top two of the right wheel and front/top three of the left wheel.

Repair the engine performance problem
It's just broken inlet valves this time.
Left engine: The two inlet valves of cylinder #8
Right engine: Right inlet valve of cylinder #1, left inlet valves of cylinder #2, #3 and #4

Improve the performance of the right engine
Some air inlet pipes need replacing. The right pipe of cylinder #2 and #4 and the left one of #7.
Repair the stopped left engine
The good times are over. It's the master rod, e.g. the rod of piston #1.

Repair guns
It's the two front ones
Check the condition of the right engine
The rocker box of cylinders #3 and #9

Replace worn exhaust system parts
Left engine: Exhaust pipe of cylinder #2 and #3
Right engine: Exhaust pipe of cylinder #7

Repair the stopped left rotor
It's the airscrew reduction drive behind the rotor.