Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4

CASE REMOVAL
There are two different types of case fixing for this appliance depending on when it was produced. Either:
Turn the clips a quarter turn with a screwdriver.
Slide the outer case upwards and then forwards to remove.
Or
Slacken the two screws.
Slide the case outwards at the bottom, then upwards and forwards to remove.