Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove connector X5 from the PCB

Measurement:

Test 1:
Measure the resistance between pin 9 and pin 8 on connector X5.
Expect a resistance of 6 Kohm or greater.
Test 2:
Measure the resistance between pin 8 and pin 7 on connector X5.
Expect a resistance of 10 Kohm or greater.
Test 3:
Measure the resistance between pin 9 and pin 7 on connector X5.
Expect a resistance of 2 Kohm or greater.