Powermatic Model 30 Sander Parts

I'm a teacher and I have a pretty well used Powermatic Model 30 sander in our shop. I need some parts for it and I'm having a hard time finding anything online. I know there has to be stuff out there. Anyone know of a source?

Along these same lines, this machine has had more down time than up time for me because of its abused state. For anyone that has had one of these, is it worth my time (and sanity) to try to get this back in shape or should I just bite the bullet and get a newer machine?