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Just wanted to add the cause of our problem on our Whirlpool QP3 in case it can help another consumer. After dismantling our dishwasher door and control panel, I found and eradicated several German cockroaches. I assume these roaches were sheltering in the control panel for warmth and they were also relieving themselves on the main PCB. Our house is located in the woods in GA and, despite regular pest treatments and a clean home, roaches in GA are just a reality.
I killed the roaches in the panel, removed the dishwasher completely from the kitchen counter, and sprayed insecticide both around the machine and inside the dishwasher door that, once dry, continues to provide protection against pests. Once I cleaned all of the fecal matter off the PCB, let it dry THOROUGHLY, and reassembled the machine in place, the dishwasher is functioning flawlessly once again. Just in case others could be experiencing the same problem, I wanted to add our fix.