How do I get to the control PCB on a KU9577?

I suspect a faulty control circuit board on a Kyoto/Iceland KU9577 freezer. How do I get to it? The board is inside trim over the door but I haven't located obvious detachment features like screws or clip points.

Suspect board or thermostat. After a long period of inactivity the freezer was switched on and started to chill as expected with red light going out. It was then disconnected, cleaned, and left for a day. Switching on, varying setting including to FF, has not activated the compressor but the red light is always on.