I spent the day doing a proper job of fitting the gearbox cover with new seals and aluminium duct tape. I then turned my attention towards the door catch that has always allowed the door fly open occasionally.
I found that the spring had broken, but managed to make the remains of it fit again with a bit of bending.
Job done!
i then realised that for the first time since I’ve had him, everything works!
I wonder how long that will last!