I discovered that the manifold was not connecting with the water supply,so the dishes in the upper tray were not being washed. This was caused because the rear hanger on the manifold had broken and it did not lineup properly into the water supply connection in the back of the dishwasher.
I removed the manifold and found that it had two part numbers stamped on it. I searched on both part numbers and received a hit on the second part number. The photo looked exactly like my manifold so I ordered it. When it arrived I installed it, and now it works perfectly. It was a very easy installation