Bought and replaced all the parts I thought could be failing in the near future, as well as the bad part. To test the fine filter assembly I used a hose and put water to the outlet. It was mostly plugged, so I replaced it. I broke a tang on the Fine Filter Hub Nut, so that is included. The Pump connector showed serious deterioration on the inside, and the Inlet Sump was split. The You Tubes were the silver bullet, as I forget details. The videos were shot well and I could check to see that everything was proper. I might add that I installed a water alarm ($11.00) as a final touch.