Does anyone know if there is some need for re lubrication?
I'm not familiar with the internals of these Canon cameras, but do know the Pentax range (S1a and Spotmatic) pretty well, and in general they don't need lubrication if they're still functioning. Tolerances on most parts are very, very tight and requires almost no lubrication. The Spotties that I have dismantled and reassembled, I just sprayed the gears and such with Q10 and then wiped it clean with a lint-free cloth ... but when you reach this stage the camera is pretty much just a heap of gears and spares.
What is more of a problem with the old Pentax Spotmatic cameras, is that the glue used on the shutter curtains breaks down and the rubber/foam of the light-seals disintegrate.
But whatever you do, don't lubricate the camera (especially with a liquid lubricant), unless you know what you're doing. If something doesn't work, and 100% functionality of the camera is important to you, take it to a professional camera repair person ... or an enthusiast/collector of Canon cameras.