The rear cover can now be pulled off easily. At least this worked for me. The cable shield at the back was quite loose and moved without resistance.

If you zoom in on the image, you can see the yellow safety critical capacitor. Next to its leads are two grey plastic clips that hold the switch assembly. these are the clips that we will need to release later.

The capacitor leads and the blue and red leads are connected to the switch output terminals which are behind a black shield so are not easily seen in this view.