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Actually the part that talking about his call the thermistor you are correct. and these only $9.55 at the following link, http://www.repairclinic.com/PartDetail/Thermistor/WR55X10025/914093?modelNumber=PSS26PSTASS a far cry from $400.00 you've already spent on it, it's part number 237 on this diagram and is in the refrigerator section, it's located right behind this little grill, you need to replace it I hope this info is usefull, thanks Bryan