There was a US contact in the old forum. They knew whether it could be done via the serial number and a check of other details. Maybe someone here has the information.
You could contact: B&O America listed in the B&O website here . Unfortunately there is no telephone number, should not be too hard to track down...
Interestingly a number of conversions were done from 110V to 240V in Australia a while ago. Not sure if its still done though...Wonder what happened to the old parts..??...
beoaus.