Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to DC Volts Set meter to measure DC Volts
Gain access to the right hand side of the PCB connector X20
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure the DC voltage between pin 13 on connector X20 at the PCB to a suitable earth point.
Note:
Colour of wires may change but test points remain the same.