Hello fine folks, I'm having an issue with my receiver. It is an Optimus STAV-3790. The right channel is much softer than the left channel. After much testing, I believe I've isolated the problem to the receiver itself. When I switch the speaker wires and put the left speaker wires into the right slot, and vice versa, the right speaker then becomes the loud one and the left is then quiet. So it seems like it has something to do with the connection on the receiver itself, not the speaker wire or the speakers since they work at normal volume when plugged into the other side. I don't believe it has a "balance" feature, I've never seen one or messed with that in all the years I've owned it, so I don't think that could be the issue either. Any advice on what to do? It's so old that I don't want to take it to get professionally repaired, because I imagine the repair fee would be more than what it's worth. I'm hoping there's something I can do to remedy it. Thanks in advance for any and all help!