One simple thing to do is pull it out from the wall and check to see if the condenser is covered with dirt/dust. (the radiator looking thing with the fan blowing into it). When these get clogged up with dirt it prevents cooling of the refrigerant and thus can't continue to cool your fridge. Just a easy suggestion for you to check. I've seen TONS of freezers, fridges, etc. have this as the problem. Dirty condenser 99% of the time. To clean the condenser you just use an air blower and clean out the fins.