I had a similar problem with my Motif Rack. A nice fellow on the Motifator forums clued me in on the part number which is the exact same as the Rack XS, and Syntaur had them brand new.
Here's a thread on Gearslutz outlining my repair:
Repair of a Motif Rack
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sam, I've had my RS-505 since 1978! It's been in storage since probably the late '80s, but I recently brought it out and found that someone has probably abused it. One of the pots has been broken off and the voicing has a semi-random "squeal". Are the pots available still (the "R" for the envelope),...