OK - and I'm only going to say this once...

the ONLY way to service any A series Canon camera correctly is to REMOVE THE mirror box totally!

Then you can lubricate all the mirror governor gears, clean the mirror box release magnet, clean the AE contact and brushes on the side of the mirror box, re-lubricate the shutter rollers so the shutter blinds run consistantly each time they are fired (so each curtain runs at 14.5MS from memory - its been a while since I've adjusted some) so that you can get consistant shutter speeds.

It also easier with the box out to clean the other switches and contacts, although you can remove and clean the shutter release magnet on the bottom without taking the box out.

The problem is that this takes time.....when I was repairing them for a living at Canon Australia and did them on a regular basis a A1 would take me 2 1/2 hours or so, a AE1 about the same (I hated working on them because of the tungsten wire running from the shutter speed dial to the ASA dial), and around 1 1/2 hours for a AE1 Program...

Even back then most technicians would remove the front plate, or the top cover and squirt in a bit of oil to stop the governor from squeaking (the squeak is caused by dry bearings on the mirror governor mechanism). And some even drilled a hole in the bottom chasis of the camera and squirted in oil that way! The nett result was that a "serivce" could be done in under a hour.....

So if you want to get the camera serviced correctly you need to find a technician who was trained by Canon to do it the correct way. I know one, but he's in Melbourne, Australia, and at 65 he's talking about retirement.......

And it's not me! Sorry - I don't do A1's any more. AE1P - yes - love those, but I won't touch any of the other A series anymore - the circuit boards are getting old and brittle, and no matter how careful you are tracks can (and do) break, and it takes hours to get everything working agian....

Cheers

Andrew

PS - and no - the T series didn't develop a squeak...they have their own unique problems with disintergrating rubber buffers in the shutter unit causing the shutter blades to stick............