Cas, as I posted on your last thread, I suspected it was only a loose cable that needed soldering. True enough, that what it was. I don't know who did the work on this sound system as I've only had mine for the last 9 months and it's had 3 owners but this is what I found.
I am also preparing myself to upgrade the whole sound system, I'm even considering doing the whole Ipad thing. But i really don't think I'll spend more than $1500