i never had a problem except for the wind knob sheered off, just keep it protected !
short list of "stuff"
make sure the pressure plate ( it gets removed when you put film in the camera ) is included (sometimes they get separated form the camera) ...
make sure the RF isn't off ( sometimes home repair people home dis-repair by mistake);
film advance has a counter ... sometimes home dis-repair messes thems up too, but that's no biggie, there is a ruby window
great camera, had one and loved it