bose poor sound from driver's side speakers

I have the Bose 6 cd in-dash system and the sound from the driver's side speakers is terrible...only when CD is playing. I saw on another web site that this is a known problem and that I can pay a repair shop $250 !! to get it repaired. I'm hoping I can order parts and do it myself. Anybody know how to fix this?
Thanks.

I would get a set of components to stick in the door. End of problem