I bought this amp back in December from mxer657 and it worked fine up until a couple weeks ago. I was listening to my set-up normally and all of the sudden my ID CTX65s cut out but I still had sound from the tweeters. The amp wasnt overheating. There was sufficient supply power just no output from the amp. I opened it up and didn't see any obvious burn marks inside. What else can I check for to diagnose this amp? I don't know where the nearest repair facility would be. I'm in NW Ohio.