Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove connectors X13 and X11 from the PCB
Measurement:
Measure the resistance between:
Blue wire on X13 and Black wire on X11
(Expect 150-160 ohms)
Brown wire on X13 and Grey wire on X11
(Expect 50-60 ohms)
Blue wire on X13 and Black wire on X11
(Expect 150-160 ohms)
Brown wire on X13 and Grey wire on X11
(Expect 50-60 ohms)
Isolate as per TOPs P4
and refit as necessary