UPDATE: It's still doing the same crap. I've asked over at lddb what I should do about it. Maybe a new pickup will fix it. I have a feeling that either the gear on the motor is messed up or the motor itself is going bad.

I would tentatively say that the R7G is working again. I got it all disassembled and was staring at the motor holder and noticed it was missing a screw! The crazy bastard that serviced it last forgot to put a screw back in it! Anyway, I cannibalized a dvd burner and found a screw with the same thread size,pitch, and length and put it in. You could wiggle the motor around with your finger before inserting the screw so I can imagine that was the problem. I'm not positive that the little shafts that hold the gears aren't broken at this point but I thought I'd test it first to see what happens. It seems like a newer motor holder because apparently the old ones are grey and this one looks black just like the ones I've got in the mail.

It's played successfully for an hour and is on side 2 now. I'll probably burn it in all night and see if it skips again.