Set Appliance State:
Mains Power Off
Set Multimeter to AC Volts 
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Is there Mains Voltage present on terminal block X7 connection 1 (Brown) and connection 2 (Blue) on the Main Driver Board?
Isolate as per TOPs P4
and refit as necessary