Remove microwave outer cover. Turn on side & locate the upper & lower door switches. Better to replace in pairs even if one is ok. Remove the wire harness to each switch. Then replace switch and re connect the wire harness. Re attach outer cover and test to see if that solved the problem. If so then well done!!
First I disconnected the power and opened the door. Then I removed the top screws holding the top vent louvers, then removed the screw at the top of the touch pad. The touch pad removes by sliding up slightly then tilting top out. I unscrewed two screws holding the door latch assembly. Press the tab to remove and replace switch. Reconnect wires, reseat latch mount by placing top bracket tab in place first, allign and secure with screws. Reseat touch pad by placing bottom tabs in first, tilt forward and press up to seat top tabs, secure with top screw. Secure vent louver screws, plug in and watch your microwave work again.
Safety TORX driver removed screw. Ceramic cover removed with ease. Shaft pulled straight up and out. Broken piece not retreivable and left in base of oven. New shaft inserted over "D" stub. Ceramic cover replaced and screw tightened.
When the ceramic cover is removed, this allows the glass cover for the UV heating unit to be removed, cleaned, replaced. I recommend doing this.