Hi, I'm using a Sony STR-DE595 amp. It's been in safe storage for a while because it messed up a while ago, and I couldn't fix it at the time. My center speaker and left speaker work fine, but my right speaker is emitting no sound. There seems to be something wrong with the amp internally, because I only hear sound out of my left ear when I plug in headphones. Anyone have advice on how to fix it? I have a STR-K840P that I usually use, but I'm not sure what to do with these. Thanks in advance! Pictures