You can access the back of the fridge by removing the two vents on the outside of the outfit. Normally held in with a couple of Phillips screws or a plastic 1/4 turn screw (use a 5p or 2p coin). Some of them may however, be nicely in with mastic, so if so, make sure you have some before pulling it off! (Unibond mastic has a 25year guarantee, and is what most caravan engineers use now.)
GA-CS, July 2008