Set Appliance State:

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

Measurement:

Measure the resistance of the Brown and Blue wires from the Spark generator to the PCB connector.
Also inspect the condition of the harness visually.
Test 1: Blue to Blue
Test 2: Brown to Brown