Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove connector M10 from PCB

Measurement:

Measure the resistance between connector M10 and the inline connector to the rectification electrode and lead.
Expect continuity / zero resistance.
Also visually inspect the condition of the lead and its connectors for good general condition.
Are the resistances as expected and is the lead in good condition?