Does anybody have a circuit diagram for this model, or at least know whether the yellow & brown wires of the dual thermostat are for the thermal fuse or defrosting termination? The evaporator was iced up and that pair of wires was open circuit. The other pair [white/blue] were closed. The defrost timer was new a year ago, so any ideas on what could have caused the thermostat [or fuse?] failure would be appreciated. Thanks Geoff.