We have had the same problem with our 2 C3500 consoles. The first time, in November 2021, I took one of them to a repair shop 200 miles away, and waited almost 3 months for the repair. They would only change the 2 faders, not an entire bank. Then I had to disconnect our DM64 and take it the 200 miles because the repair shop did not have any way to test without it. When he connected and tested, even more faders were failing. He did a firmware update, and they all started working. I updated the firmware on the other console, and they were fine for a while, but now both are failing again. I do a fader calibration on both desks before every service, sometimes having to give the faders a “nudge” to move from their extreme positions. Both consoles have been inside their entire lives and covered when not in use. American Musical says A&H does not recommend fader lube, but I can’t have these consoles out of service for three months again waiting on a repair.
