Hard to say.Take a look at the blue connector on the pc board,there is a black and a white wire going to the connector,looks like the top 2 pins behind the conn.,(following the traces on the board),go up to the top 2 jacks.Are they the spkr.outs? Judging by the gauge of the wire,it's got to be either output or power supply related.Sorry I can't be of more help,Mel.