I have this old even tria where one of the channels went out. You can head a faint sound in the monitor that is connected to that channel. I have already ruled out the monitors since i connected both to the channel that works. I have been testing most of the components on the board for contiunuity, resistance, and all the caps. I even replaced one of them thinking that would solve the issue. I am new at testing sound equipment but have some knowledge on circuit board layout. I even purchased a PC O-scope. Any help would be greatly appreciated. I have attached 2 pictures of the non-working channel and of the connections to the subwoofer. The arial shot I took in of the other working channel which is identical. Also a power transformer is missing from the picture since I had to remove it being so heavy.