the top shelf dos'nt get enouugh water prssure to rotate the spray arm this leaves the dishes dirty
The bottom spray arm is working well lots of pressure no problems
There is no blockage in the the tube that feeds water to the top spray arm and the jets are clean There are 2 outlets from the pump , a good water flow is not evident from the outlet which supplies the top arm suggesting a blockage or pump problem

arthur dorian, April 2011