Look at the upper left corner of the fridge and check the air vent for airflow. Remove the cover and check the damper. If jammed shut, open up and remove power to the motor there. I tried to find this in the parts but no dice.
This should fix your problem. If not, you may have a evaporator fan motor running slow, just replace it. Please post results, with your freezer below zero, you fridge temperature should be below freezing. Normal temps should be plus 10 in freezer and plus 35 in fridge.
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