Sounds like that amp on that side is going to go out. i had a wt800A that did the same thing. It comes as an assembly and the two screws in the top hold it in. It's not a hard thing to replace if you can still order the amp from Eden. Granted it was about 10 years ago and it's still going today. Hopefully the basic structure hasn't changed even though the company has .
DA GOOVE MAKES IT GO ROUND!!
Brubaker Brute Club #34