A Kitchenaid repairman came to look at the dishwasher and found that the rotor needed to be replaced but none were in stock. The part was on backorder and the price would be $75 plus a $55 installation fee.
I went online and found the exact same part at PartSelect for $37.98 plus shipping and when it arrived, replaced the defective rotor easily. Now the dishwasher is whisper quiet like it was when new. I saved a little over $80 by ordering from PartSelect and replacing it myself.
Dishwasher fill valve is in on bottom of diswher. Dual drawar dishwasher has doubble solenoid valve for fill. Lower drawer is pulled off and turned sideways to gain access. Access is still tight. Good news is that I bought two new hose clamps. Best way to remove old hose clamps is to saw through part of clamp mechanism. Inlet line hooks up with a union-type connection that contains a seal that looks like a garden hose washer. Sawing through solenoid valve discharge line(s) hose clamps allows valve removal without damaging valve discharge hoses. Large person may have difficulty doing repair if lower drawer can not be slid to right after pulling it out. Other annoyance is that new valve did not come with new inlet line seal. I used the old seal sucessfully. Hardest part was getting old clamps off and getting fill line connection back on. Easy to cross-thread fill line connection to fill valve. Also easy to damage fill line if there is not much space between back of dishwasher and wall. I ended up making a metal fill line using a 3/8 NPT brass pipe union that had the same threads as on the fill valve inlet. Half of union is thrown away and the remaining half is filed flat. This allowed using an elbow to turn the fill line 90 degrees as it come through the back of the dishwasher. Back of dishwasher is only 2 inches from back of wall.
took the racks and plate of dishwasher out wiped out center circle where impeller and center ring fit. the center circle became blocked with food so i had to clean it.