u/Camigamer101

I have 2 peavy deca 424 amps and I was curious if anyone know what my problem might be. On channel A the audio is absolutely perfect and crystal clear but on channel B there is hardly any signal and when you touch the inner part of the rca jack to the outer of the jack it works perfectly fine is that a potential grounding issue that can be fixed or is this amp toast?

Just picked up a 9072 mixer and 2 peavy Deca 424 amps i also got a nemark DVD01 in the rack too but I ran my DVD01 to CH3 amd its on CD but I am not getting any audio to my amplifier yet the mixer shows its getting signal. If I switch the amp and DVD01 inputs and outputs to program loop it works but if I have my amps on program outputs it doesn't work at all. Does anyone have any idea what it could be?