There are about 8 voltage measurements on the rear door power supply. Did you check them all? The last one I purchased was about 3 years ago...in fact, I have an SX-200 sans RDPS :-) and I absolutely don't plan on replacing it thanks to Red Carpet Inn in Muncie, IN that forgot to pay their bill. I think I paid about $300 or so for the part with shipping. You might check with Fred (55 footer) on this board to see if he can scare one up.

I got mine from eBay from someone else, I think in NJ, but I don't see any listed now.

Carl