Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove the connector from the fan assembly
Remove connector X3 from the PCB

Measurement:

Measure the resistance of the fan DC wires as per the table below:
Fan ConnectorConnector X3
White Pin 17
Brown Pin 4
PinkPin 16
Orange Pin 5

Expect continuity / zero resistance on each wire.
Also visually inspect the condition of the harness and its connectors.