My GE refrigerator freezer is not getting cold enough. I have measured the temp many times as not to get an an-nominally. It ranges from 14 - 18 F. This isn't good enough to push out many ice cubes. I think the defrost is working ok, and have read replacing the the thermistor in the freezer will help. Problem is I can't find it on the parts diagram or in the freezer itself. Can someone make suggestions for this or other parts to replace and/or where and the part number of the thermistor sensor.
GTS12BBPALWW GE Top-Mount Refrigerator