After turning off the power, I checked the switch contacts with a Volt / Ohm meter. Since there are four switches, I was able to compare my resistance readings and determine that one switch was bad.
I went to the AppliancePartsPros.com website and located my switch. The pictures and diagrams on the site made it easy. One of your pictures looked almost identical to the one I took off my unit.
I ordered the part and paid extra to be sure it arrived the next day.
The part arrived as promised. I replaced the switch and Thanksgiving was saved.