I called URC many times but could never wait long enough for someone to get on the phone. I eventually sent it back with a note-- "Can you either clean or replace this back?" 3 months later after I called many times to find out what was up, they called me back and said it was $100 to repair-- wouldn't even look at it first-- I said send it back and they did-- URC was worthless on this one.

I'll take Daniel's suggestion-- anyone have an MX-500, MX-600, MX-650, MX-700, MX-800, MX-850 back?