You need someone physically there to help you. It's impractical to try and troubleshoot via forum guesses. You'd end up having to either video tape or photograph inside the cabinet at various locations like the speaker, the wire harness, and the PCB itself.
For now, you might want to take the wires going to the speaker and hook them up to a new speaker just to see if that's the problem. If that doesn't work, then you work your way down the wires until you get to the board harness to check all those connections.
Edited: 06/08/2013
at 09:44 PM
by Firebrandx