With these prices for used bodies that probably work, I wonder about repairing these beauties. To me, it's almost an act of faith to repair and maintain fine equipment, but if another body is only $50, it's hard to justify repairing. For SLRs, I'm tempted to check the light seals, just run the camera till it dies, and then look for another one.
An additional thought: Seems like the electronics and in particular the micro switches are the most likely point of failure. nobbylon mentions "erratic shutter" on a Contax 159, and I have one on an Aria body. This is a failure point for the Hexar AF. I'll fix the Aria, but probably would not fix a lesser camera. Faulty shutter release kills the fun.