The turbidity sensor did the trick. My KitchenAid dishwasher was acting up. Sometimes the dishes were cleaned, sometimes they weren't. Sometimes the dishes were dry. Sometimes they weren't. AppliancePartsPros listed the turbidity sensor as one of the top reasons for inconsistent performance. I figured the other reason for inconsistency was possibly the motherboard, but given their cost, went with the cheaper option first. Easy repair and the dishwasher is performing as it should now.
This is the second repair that I have done on an appliance (the other was my clothes washer) and I could not be happier with my experience with AppliancePartsPros. Their repair videos are outstanding and shipping is fast. I've gotten my parts within a couple of days. If I ever have to make any more appliance repairs, AppliancePartsPros is where I will turn to get my parts.