Michael, i'm kind of lost here, or missing something ??
You write it did not go to a B&O shop, you had to pay an icredible bill for , basically, a not repaired set and you blame B&O for it ?
I agree with Graham (and believe me, i'm also critizising B&O where appliccable): any technician with proper skills should be able to open and service almost all B&O equipment.
I''ve fixed already quite some different B&O things without doc and most of it is really service friendly and well designed so one can swap parts / service relatively easy.
Also if you don't have parts ''close to home'' for sure a dealer would send it to you (or a proper repair center) if needed.
I have to admit nowadays i'm kind of dissapointed too when i can't get parts for some of my 20 years old stuff anymore but from any other brand you wouldn't get parts after 5 years !
Which brand sells (still !!) the battery lid and even the rubber feet for a remote control ??? (indeed: B&O).
So yeah, if i understood your story correct you should ''blame'' a repairshop for being unable to fix or at least proper advice on this repair.
If their excuse is ''exotic equipment'' i would say if one lacks skills to service ''service-friendly'' equipment, they shouldn't touch it at all and leave it to people who can....
PS: is it a BeoCenter 9000 ???, they needed 6 months to find out the cd player isn't available anymore (after 20 years..) ??
One phonecall of 3 mins could have told them that.
Apart from that, sometimes (like on German Ebay: 50 euro) here and there new exchange units still pop up (i believe it's a Philips CDM4 mechanism).