forgive me if this question has been asked before, but I've searched the best I can and come up empty.

About a month ago, my rear wiper on my '95 850 Turbo Wagon started operating extremely slooowwwwlyyyy!
The other day it stopped working altogether. I suspect the motor was on it's way out and has now pretty much run out of gas? I was able to help it along to get it back to the resting position, so there is still some sort of life in it (ruling out a relay or fuse?). My question is, does this sound like a new motor, or might I revive it by taking it apart and lubricating it? My dealer has said it's a fairly expensive repair ($200+) to replace the motor, so I'd rather take a crack at it myself if it is the motor. How difficult is the replacement? I've heard taking apart the tailgate trim is a little tricky as the clips usually break off.

Any good source for used/aftermarket rear wiper motors.

I imagine this must be a recurring problem with the 850's. Any info would be appreciated.

Jeff