Open the freezer and look for frost buildup on the back panel. If you see frost, you have a defrost problem. Possible causes are the defrost heater or evaporator thermistor. You will need a multimeter to test the components. The heater should show continuity. The thermistor should be between 10k and 80k? at fridge to freezer temperatures. Anything less than that, the thermistor is bad. Remove the back panel of the freezer to access. The heater is mounted to the bottom of the evaporator coils. The evaporator thermistor is mounted to the top of the evaporator.
If no frost, I would suspect the freezer thermistor. It's at the left lower rear of the freezer or behind a grill on the right wall of the freezer. Same thing, if it reads less than 10k? replace it.
If all the components check good, the only thing left is the main control board. You can find this behind a panel on the back of the fridge.
Part numbers: Defrost heater WR51X10055, thermistor WR55X10025, Control board WR55X10942.
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