Dometic microwave no START

When Chinese are tasked with circuit design, standardization goes out the window. I've encountered units that devoted only part of a control circuit to a control circuit fuse. A turntable operated by a control circuit fuse. Keypad lighting with the power fuse. When I had oodles of time and electronics I remade m commercial LG circuit boards using better transistors, higher voltage capacitors using a hot air gun.
I also sealed the board using 3M sealant. The unit is alive and well a hundred feet from cashing tropical Pacific Ocean waves, nine years later.