Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Ensure ignition electrode is removed from the burner door
Disconnect lead at PCB

Measurement:

Measure the resistance of the ignition electrode and lead.
Expected resistance approximately 1 Kohm.
Also visually inspect the electrode and
lead for any signs of damage.