Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to AC Volts Set meter to measure AC Volts
Gain access to PCB (use insulation mat as necessary)
Release the front facia by undoing the 2 screws at the top of the facia
Mains reset switch On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure voltage across the brown and blue leads on the mains reset switch.
Mains voltage expected.