Hi Bryan,
Attached to this post you will find some instructions as well as the tech sheet with the wring diagrams.
You also have to check both fuses, the door switches, the cavity thermostat (TOD) and the magnetron thermostat (TOD). All of them have to be checked for continuity.
Here are the breakdown diagrams and
Replacement parts for Whirlpool KEMC377KBS0 BUILT-IN OVEN W/MICROWAVE | AppliancePartsPros.com
Gene.