Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect connector J2 from the ignition PCB
Disconnect wires from APS, make a note of the connections
Disconnect wires from APS, make a note of the connections
Measurement:
Inspect the condition of the harness between the APS and the PCB.
Check for continuity (zero resistance) between the ends
of the three wires running from the PCB to the APS.
Check for continuity (zero resistance) between the ends
of the three wires running from the PCB to the APS.
Isolate as per TOPs P4
and refit as necessary