Larry's right, Owen. When I was repairing the circuitry on our old Sharp in the house, I noted at least one fuse in there. You may have to get a new one at an appliance parts house if yours is blown. A diagram on the inside of the microwave housing may offer a fuse rating and number, but as I recall it is a fuse common to microwaves in general, and the old fuse should be marked like on an old style auto fuse.
Taking the housing/shroud off entails a lot of screws and a tricky push forward to release from a top edge catch, but once off there was good access to most components. Just don't do it with it plugged in of course, and be aware of warnings not to touch capacitors and other parts in there that could provide a shock even when not plugged in. If you aren't comfortable or experienced with such endeavors, be safe and have an appliance repair shop check it. It's going to have to be removed from the coach cabinets regardless.
Joel
