I'd like to add here that Martin is right about the "swap and go" service mentality. The trend has been for some time and with the consequence of many technicians simply not being capable of troubleshooting on the board level.
The better shops will decline to service, the less reputable ones will attempt a service and return your equipment worse off than you left it. So bring it to an authorized service center or send it one of our qualified friends here.
In fact I think it is better if you sent it to a pro here because B&O shops have a habbit of swapping parts too. Its mostly a function of cost and time.
For example, a friend brought in a Beocenter 9500 for repair; the glass panels had unglued. Rather than reglue the support pieces back to the glass panels, the shop simply ordered a replacement set from B&O. The otherwise perfectly usable glass pieces were thrown out.
The most troubling thing about this is that it depletes the inventory of parts for someone that really could use them (e.g. someone with shattered panels due to a shipping incident) Another example is that the CDM-4 philips pickups are unavailable now. I know that many service centers elected rip and replace rather than servicing the actual pickup; in most cases it was a single capacitor that needed to be replaced. Speaker drivers with rotting foam is a third example.....
So...even if your equipment gets a module replaced... keep it as someone here might be able to salvage it. We need to keep the parts in circulation.
Derek