So... I found an FM online to replace one that was stolen in a burglary years ago. It looked good but had a shutter issue so I took it to a local shop for a CLA. It took 4 months and cost more than the camera is worth, but it has new seals, looks great and seems to work,.. mostly.
After I put in a test roll of film I noticed that the frame counter does not reset or advance. I can't open it up until I go through this roll of film, but when I can, what should I be looking for?