Thanks for the tips folks. Appreciated.
Turns out the service manual and diagnostic codes were taped behind the footer panel. I ran the field service test, which indicated there was an error with "Motor - low current". Running the manual test for "Wash Motor" also produced an error. I see there are a few "motors" in this thing though, but running the other manual tests for "Vent", "Dispenser", and "Drain pump" all pass. At this point, I'm assuming the next step is to replace the wash motor. Is this reasonable? I also see I can use a meter to read the ohms in the wash motor. Could it be something else besides the motor given the results so far?