Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove the clock harness from the display PCB
Disconnect the leads from the clock

Measurement:

Measure the resistance across each of the
wires on the clock harness.
Expect continuity / zero resistance on each wire.
Also visually inspect the condition of the harness.