An easy fix that gave immediate results! The dishes were not being properly cleaned - particularly those in the upper rack. After reviewing the problem on the APP website, I decided to replace the lower spray arm (which is the ONLY spray arm in my 20-year old dishwasher). I first watched a video on how to do the replacement. The only tool that was needed was a screwdriver, which I used to loosen the old spray arm. I took the old arm out (GROSS!) out and screwed the new one in. Loaded up the washer, turned it on and presto! Everything came out sparkling clean. AppliancePartsPros.com to the rescue again.