Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove connector X25 from the PCB
Remove the connector from the Stepper Motor

Measurement:

Measure the resistance across each of the wires in the harness to the stepper motor as below.
Pin on connector (X25)Stepper Motor Connector
5 (Blue)Blue
3 (2 Reds) Each Red
11 (Black)Black
10 (Green)Green
4 (Brown)Brown

Expect continuity on each wire in the harness.
Also inspect the condition of the harness visually to check there are no sections of damaged insulation.
Note: Each pin on the PCB connector is numbered.