Have same problom with mine rear chanels " Click" out. not hard to fix if you feel safe useing sodering gun. Good luck finding the part anywere else buy from sony at 18 a relay ! amazing radio shack sells one just about the same for 5 but dont want to risk it.

I had forgotten I had posted here! I found the solution a while back. There are four relays in the receiver that are causing the problem. I'm not sure if it is all four or one or two? I was able to find an equivalent part from a better manufacturer and I swaped out the parts with a little light solder work. Works great now!