I had a similar problem with my Lexicon 93 and they fixed it pretty fast and it sounds great! I stopped by to pick it up personally and noticed they had fixed another that was ready to ship out to the owner. I was also surprised to see that they repair pultec, vac rac, dbx, urei, AMS (their specialty) and SSL as well as power amps and other stuff. Very surprised and very pleased.
Granted I had to pay 375.00 for the repair, but mine was not even working on one of the delays and the sliders were way noisey - no feed back as well...so I guess not so similar problem....great repair though.
Here's their contact...
Studio Electronics Burbank - Pro Audio Sales, Design, Repair, and Service