CONCERN: Customer reports refrigerator not cooling but freezer is fine. CAUSE: Found ice built up on back wall and all around evaporator. Tested evaporator fan, thermistor and defrost bi-metal all passed. Refrigerator door left open at some point letting condensation in not allowing evaporator to defrost correctly. CORRECTION: Cleared all of the ice out of the refrigerator and let customer know to make sure doors are closed tightly every time. Tested refrigerator. Operation now normal.