Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Gain access to display PCB
Disconnect X5 from the display PCB and the inline connector attached to it

Measurement:

Test 1:
Measure the resistance between the pink and
right black wire (refer to picture) at the inline connector.
Resistance should be approximately 33Ω, plus the resistance of meter test leads.
Test 2:
Measure the resistance between pin 3 (brown) and pin 4 (dark blue) on X5.
Resistance should be approximately 0.5Ω, plus the resistance of meter test leads.