If the small glass fuse is really good, and board is bad, like technician said; replacement is a solution. Our Dometic microwave quit, and I found a local appliance dealer that had saved a scratchNdent Dometic. I bought the components needed for <$50, repaired the oven.
If you desire a new oven, most any wall-mount microwave of the same configuration and measurements will work. They all come with a baseplate.
2000 Winnebago Ultimate Freedom USQ40JD,
ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy