The CD decks are no longer available from anywhere but luckily most faults can be repaired.
Your CD deck will most likely need new capacitors on the servo board, that's very common with
these symptoms and it's a fault that seems to hit all machines sooner or later.
Depending on the deck version mounted in your Beocenter, I can supply a suitable kit and if a correct
kit is not available, one can be made.
Grab a kit and tell the repairer to replace it.
The door(s) will need new belt(s). I am not sure if these are still available from B&O but I may be able
to supply if B&O can't.
These are standard issues, do a search on the forum and you will find lots more info.
Martin