When earphones are plugged in the main speakers are not longer muted
I have a Bose Companion 2 SerieII Multimedia Speaker System. The speakers have a front panel jack for earphones. When earphones are plugged in the main speakers are muted.
Perhaps due to heavy use this mute function does not work anymore and sound comes out of the earphones and main speakers.
How can we take apart the covers to get at the jack and replace it?