First image shows the small (150litre) basic fridge. The added digital room thermometer on top is useful but not essential. Disconnect power and pull fridge out from under counter to access the rear. No need to empty fridge, though it does make it easier to move. Fridge contents will remain cool for hours.

Second image shows the back of the fridge. Undo two Philips screws arrowed. Lift the back of released panel slightly and push slightly forward and lift off and turn over. Note that there are cables attached to the top panel so twist it so it can lie upside down without straining the cables.