So I'm trying to help my friend fix his receiver. He has a proton D940. Sounds very, very good. Its a bit screwed up though. The right channel doesn't work on either A or B (right now I'm running it from A and B with both lefts and set to mono). I'm not sure how these receivers work, is there possibly a transformer for left side and one for right side? Maybe something got blown? Unusual that both lefts work fine but neither rights do. Also, there's a couple random buttons that, if you press, the thing starts massively cutting out and getting scratchy. I attribute this to him trying to clean the whole thing out with steel wool Hopefully that can be fixed with some contact cleaner and dust spray.