I wouldn't worry too much about the film transport problems. Irregular spacing and skipping doesn't necessarily indicate a need for expensive replacement parts. According to what I've read from various experts a CLA should fix it up. But don't use the camera any more 'til it's fixed - the residue of old, dried lubes might cause something to be stressed.

The lens can probably be disassembled and the existing growth disinfected. As long as you protect the lens from flare inducing light you'll probably never notice any problems from a spot.