My refrigerator gets warm when I put food on the top shelf. I checked the compressor, relay, capacitor, defrost temperature control in freezer, thermistor, refrigerator thermostat, coils are clean, ice maker and water work, no frost built up on the inside of refrigerator or freezer. When I took off the back on the inside of freezer there was a little white frost on the fins where the evaporator fan blows. No funny noises happening when it runs. Doesn't run too long or too short of time. I can have food in the freezer and the refrigerator, but just not on the top right shelf. I've had this refrigerator for 6 years and I don't want to throw it out...I'd rather fix it. The evaporator fan runs and seems normal. I don't know if it is possible for it to run slower or if it's a situation where it runs it works or if it's out it won't run at all. Air does blow into the refrigerator lightly. I checked my nieces refrigerator and it seems to be coming out the same amount as hers. I don't know what to check next. I feel like it's a defrost problem or could it be the temperature control board in the refrigerator? Please help!?