John,
Welcome to Beoworld !
Of course your Beocenter can be repaired.
We hear that "parts are no longer available" story too often. B&O can probably
no longer supply the internal modules etc. but luckily there are people, at least here on Beoworld,
who can diagnose and repair at component level.
I'm one of them but I'm in Denmark and I don't dare to think of the shipping cost.
Instead, I suggest you try contacting Beoworld member nobby, he's in the UK and may be able to help you.
The fault in your Beocenter could be as simple as a dead capacitor.
I can supply Tape belts and other parts if needed.
Martin