I have a common failure on 5000 and 5002...On powerup, signal/IOC remains on and CH does not pass audio. None of the internal LED's remain lit. It appears to be psu related as the Power supply for the bad channel does not appear to have the same +v and -v as the good channel. The good channel reads +-44v, the bad +80/-0. The voltage off the 4 large bridge rectifiers all measure the same, so it seems isolated to the small board with the diodes, mosfets, and caps attached. Is this caused by a psu problem? Or is this a sign of a bad output module? Swapping Output modules did not seem to effect it. Can I measure the +-V with the output module removed without damage? Thanks for any help.