I have a 2013 17B. A tiny plastic part broke on the bottom inside fridge lock mechanism. So I cannot lock the fridge when towing; I have to duct tape it, which has removed some of the silver coating on the fridge door and some varnish on the cabinet. When camping I remove the duct tape and just shut the fridge door, but in a while the door pops open a bit, although my food stays sort of cold and the freezer food does not thaw. But how can I get my fridge working like when I bought it?