Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Disconnect connector X1 from the pump PCB
Disconnect the plug from the pump and unclip the red cover

Measurement:

Check for continuity (zero resistance) between each end of the wires to the pump.
Inspect the harness and connectors for good overall condition.