I replaced the dishwasher circulation motor. I also replaced the impeller assembly, although it turns out that was not necessary. Actually replacing the motor was straightforward: Remove the upper and lower racks. Turn off the breaker and water supply. Disconnect power, supply water and drain hose. Slide out the dishwasher. Inside the dishwasher, unscrew the two screws holding on the bottom rotating sprayer and remove the sprayer, unscrew the one screw holding the little metal bracket and remove the little bracket, remove all the long screws holding down the filter assembly, unclip the tube that feeds the upper sprayer (at top and back) and rotate clockwise (looking down from above) to unhook it from the filter assembly, remove that tube, lift up and remove the filter assembly, unscrew the screw that holds the impeller to the circulation motor shaft (this is a left-handed screw, to screw clockwise to loosen), pull off the impeller, lift out the assembly below the impeller, and finally very carefully slide the grinder blade off of the circulation motor shaft. Close the dishwasher door. Tilt the dishwasher on its side, disconnect the wiring harness on the motor (you will need a small slotted screwdriver to pry back the tabs), remove four self tapping screws that hold on the motor cover plate (don't lose the screws), unscrew the four screws that hold on the dishwasher circulation motor, pull out the motor, then install the new motor by doing these steps in reverse.