I replaced the control panel. I guess the problem could also have been the control board. I felt more certain about purchasing the control panel after removing the old one, and ohm-ing out pins that should have indicated small resistance when pressing front panel buttons, but all indicated open circuit. A result of moisture that ruined the thin wires in the ribbon cable, apparently a common problem of the Maytag/Whirlpool dishwashers and the subject of a class action lawsuit (Maytag would not help me). After replacing the control panel, the dishwasher hummed to life but then died again toward the end of the heat cycle. Not sure why but I blew a "bi-metal switch". I don't know if this was related to my control panel failure or replacement. But I replaced the bi-metal switch and the dishwasher is working fine now.