This is the second time this has happened to this dishwasher in three years. AppliancePartsPro replaced my previous replacement control panel, as it was still under its own 1-year manufacturer's warranty. I'm not delighted to be replacing this part more than once in a year, but I'm delighted with the service APP provided.
Simple repair - six screws (torx bit) and a ribbon-cable connector. Everything works again as intended.