Rock-Ola Legend 6000X sound problem

Lost sound in left channel of jukebox. When machine is in non-playing
mode I hear hissing coming from the speakers. When a song is selected,
the hissing seems to stop but get no sound. Right side plays OK. When I
cut power to the unit I hear a loud "pop" through the speakers. I
believe the problem is in the CD interface board (#56877-A) on the front
of the player. I have 3 of these boards, each has a different issue. I
replaced the cable from the board to the amp with no improvement. Anyone
out there who has a working board, or can repair mine?




-- 
x86racer