CONCERN: Customer reports refrigerator is not working like it should. CAUSE: Found evaporator leaking freon. CORRECTION: Replaced evaporator and receiver dryer, checked for leaks and tested. Operation now normal. CONCERN: Customer reports refrigerator is not getting cold on refrigerator side. DIAGNOSTIC AND CAUSE: Inspected compressor operation, evaporator fan and condenser fan operation, all normal. Found frost build up on evaporator coils. Tested defrost heater for continuity, Found defrost heater and limiter shorted. CORRECTION: Replaced defrost heater and limiter. Tested operation, all normal upon completion. CONCERN: Customer reports refrigerator is not cooling properly. CAUSE: Found refrigeration system low on freon. CORRECTION: Recharged system and tested. Operation now normal.