How to Troubleshoot & Replace Whirlpool AP4357880 / W10211972 Switch

Took the control panel off. Took the door latch mechanism parts out. Paying attention of where the wires were connected (I drew a schematic) so I could put the microwave wires back together again. Then I put the new switch in place. I used a set of "star" wrenches to remove the door-latch hardware on the microwave. This is a unusual set of wrenches I happened to have on hand. 

I REPLACED ALL THREE SWITCHES 

After locating an electrical circuit diagram, determined the 1st area to look at where a direct short could occur would be the door interlock switches. Testing and then disassembling the switches showed two of the three micro switches were welded closed, definitely, a higher rated switch could be used in this circuit. Replaced the micro switches AND the interlocking support where the 2 switches mount ( I ordered the interlocking support because I assumed the plastic retainers would break when changing the switches - and they did!).