The freezer temp is -15 ref side 36. the evap eventually freezes up. when it attemps to defrost water runs inside of the freezer cabinet. have cleaned the drain tube. and eventually freezes up again. checked the ref side thermister, 2.96k ohms at 72 degrees. print show thermister in the freezer side but I cannot locate it. The high temp alarm sounds on control panel. freez temp -15 ref 35. changed main control board. same problem after two days.