The fridges rust out from the inside of the tubing to the outside. You can't really tell the condition just by looking at wether or not it's rusty on the outside. Usually you can smell amonia when it's failing, but since this camper sat unused (I'm assuming) for a long time the amonia smell may have disapated over time. If the inside of the fridge is in good condition then it will be worth approximatly $600 to get it fixed, and that is a small price to pay compared to the hours invested in the rest of the camper. Hans