BeoBiker:
I know it is hard to guess the cause and price but how much is a normal or average repair in a normal case? I have contacted my dealer but they are closed and I just want to know what I am dealing with.
Are you an experienced electronics technician??
If yes, there is a fighting chance that you could fix it your self with some help from this forum. Cost would possibly be as little as a couple of pounds.
If no then you will have a problem finding a B&O technician who will know what to do, if the updated CD mech kit is no longer available. B&O service will in all probability say that it is obsolete!
As Die_Bogener says, you will need to find an experienced repair technician in your country. Assuming that you are in the UK, you will have difficulty.
If B&O write it off and you are not an experienced electronics guy then my advice is to sell it on ebay as spares or repair.
I am sorry, but this is the real world in this day and age.