My Samsung Fridge RB194ACWP had temperature problem. The displayed temperature on control panel does not match the actual compartment temperature. The difference between them is 7-9F. There is no leaking, break, etc., and I left enough spaces around it. I had defrosted the unit for 24 hours, but that did not help either. Do I need to calibrate the temperature and how can I calibrate? Thanks in advance.