Use the multimeter to check for 120VAC across the Blue and White wires at the wash pump motor. If the correct voltage is present and motor hums, try to turn the impeller (with power off). If that doesn't help - replace the motor Part number: AP5272389
If there is no 120VAC to the motor - check the wire harness between the motor and control board, and if that check s out OK - replace the control board Part number: AP4392629
Here are the breakdown diagrams and http://cdn.appliancepartspros.com/im...29006586_2.gif
Post the results.