Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Hinge down the PCB housing
Remove the fan harness from the fan
Remove the 6 way connector from the lower
end of the PCB (brown, green and white wires)
Remove the 3 way connector from the top of the PCB (blue and red wires)
Remove the 6 way connector from the lower
end of the PCB (brown, green and white wires)
Remove the 3 way connector from the top of the PCB (blue and red wires)
Observation:
Check the continuity and condition of the fan harness leads from the fan plug to the appropriate PCB plug.
Expect continuity / zero resistance on each of the wires in the fan harness.
Expect continuity / zero resistance on each of the wires in the fan harness.
Isolate as per TOPs P4
and refit as necessary