Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Gain access to clock wiring
Disconnect orange wires from the clock

Measurement:

Check for continuity (zero resistance) of the harness between the ends of the 4 wires running between the clock and the PCB.
Also inspect the harness and connectors for good overall condition.