I really need some help with this. I have a whirlpool refrigerator M# WRT571SMTWOO. Someone has removed the thermistor from the freezer and I can't find a replacement. My parts distributors can't find one on the parts diagram. Also It does not have a traditional Bi-metal/ Termination Thermostat. They seem to be In-line. Is this new? Also I could use a service manual for this.