My ASW 650 stopped working a few years ago, I called B&W support (in L.A.) who told me to extract the amplifier module and send it in. Instead, I opened the unit (not exactly easy but still doable) and took the fuse to a service shop for a replacement. That did the trick!
P.S. Always use caution servicing electrical equipment.
P.S. Always use caution servicing electrical equipment.