Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect X2 from the PCB
Measurement:
Test 1:
Measure the resistance between pins 7 and 8 at X2.
Resistance should be above 1MΩ (or O.L).
Test 2:
Measure the resistance between pins 8 at X2 to a suitable earth point.
Resistance should be above 1MΩ (or O.L).
Measure the resistance between pins 7 and 8 at X2.
Resistance should be above 1MΩ (or O.L).
Test 2:
Measure the resistance between pins 8 at X2 to a suitable earth point.
Resistance should be above 1MΩ (or O.L).
Isolate as per TOPs P4
and refit as necessary