one channel lower than another

[wormraper]

ok guys, I have an old JVC AX-R551 stereo receiver that I've used to power a couple speakers for my bedroom tv. recently one channel suddenly just DIPPED in output. the left channel that is. the right channel still puts out the same output but the left channel is much lower now. when I adjust the volume level they both go up and down the same amount but it's wildly out of balance as you can guess with the left being much quieter than the right channel. happens on BOTH the A and the B zone of inputs identically. any thoughts on if I'm just out a receiver or if this is a known issue that can be fixed (besides adjusting the balance knob crazily and boosting volume )