Unscrewed numerous screws holding the "body/shell" to the microwave. Removed body. I then unplugged top door switch, replaced it with new one, and "tested" the new one. I fixed our $400 convection micro with an $18 switch. NICE!
Followed the online videos to enter the cavity to the switch holder. Noticed right away the dreaded capacitor was in back right corner behind where the touch pad had been removed. I isolated the capacitor with an old computer mouse pad for extra safety. Took some manipulations to get the switch mount out from behind the wire bundles. Once out front, easy to use small flat blade screwdriver to release each switch and replace with matching new switch. Only one switch was bad but replaced all three. Back together and working great.
Two screws to remove upper from vent. Two screws to remove the didgit panel lift ip to remove and put aside remove the two screws that hold the door sensors. Depress the tab to remove the defective sensor disconnect the electrical connector and replace the new sensor snap it back into the holder install the two screws, install the didgital panel and vent panel to complete the job. Please be aware that there is a video of this procedure on Y tube
I found an exploded view diagram of of my microwave model which was very helpful. You need only remove outside metal skin by removing 4 screws on either side and 4 more on the back. Remove 4 plastic hole plugs from the top mounting inserts. Gently pull sides out and lift up and back to remove outer skin. The fuse is located on the back right corner behind the control panel. You access from the side. The fuse is under the spreader bar. Lift fuse up gently to remove.
P.S. It was the MSP Capaciter and or the interlock switch, snap apart 21A (19) failure that actually caused the ceramic fuse to blow.
Removed the outer cover to access the door switches. Turns out there were three switches, but I determined that only two were bad. When the small colored tab on the switch is pushed in it should make a clicking sound. The two bad switches had no resistance and did not make any noise when pressed. Removing the switch is relatively easy, you simply pull it away from a couple small tabs holding them in place. After reconnecting the wire leads, insert back into the holding tabs and install the cover.
The microwave turntable rotates when the door is open.
This is sometimes described in other repair notes as "microwave 'runs' when door is open." With power disconnected: Remove the microwave's metal grill surround. Three lower screws accessible with lower oven door open. Two screws accessible at top of microwave door opening with door open. Remove microwave control panel: Remove two femaleTorx head screws (#27?) that secure the panel, accessible at right side of door opening. The right side of the control panel is secured by plastic tabs fitting into slots in the oven frame. Take good care to note how these tabs disengage from the slots (lift and shift). Tab breakage very possible! Once disengaged, the panel hinges outward and downward and is self-supported. It may be necessary to guide some of the wiring out of the way to fully lower. There are three door switches, one "monitor" and two "secondary" switches. All switches are housed in a plastic frame, which must be lifted out of position for access, each switch is retained by flexible plastic, breakable-looking hooked fingers. Also note that the electrical connectors have tiny release tabs that must be depressed in order to pull them off of the switches. In my case the topmost switch, one of the "secondary" switches, was clearly bad since there was no "snap" or click when pressing the switch's button. Maybe you can determine which switch is bad before proceeding but I had ordered all three to avoid going through this exercise again any time soon. Replace switch or switches, place switch carrier back into position and otherwise reverse the disassembly steps.
Pulled it from the wall remove the front vent covers removed the control panel remove the door switches by a special screw driver bit which looks a star remove the electrical terminals pressed the plastic clip pulled the switch replaced it with new one then followed initial steps backward