The machine does not shut off after the ice bin is full. I think the bin thermistor may be bad.(WR55X10018) The specs I have calls for a resistance of 25.9-29.8K ohms. Since this is a temperature sensitve device, at what temp should I measure this? GE is of no help. I measure 12.5k @ 70F and 33.5K @ approx 33F. Before I plunk down $60 for a new one I would like to make sure the one I have is bad. Thanks