Despite an initially good wash cycle, my recent attempt to repair our dishwasher by replacing the turbidity sensor was not successful. Today, I removed the unit entirely and did a complete teardown of the drainage system. I discovered the drain pump impeller shaft completely wrapped in hair and the various drain hoses filled with all manner of gross debris. After an hour of thorough cleaning, I returned the unit to service and the first wash looked good. I will wait for a couple more days this time before declaring victory.