Update...We have left the extreme heat of Arizona to the reasonable heat/higher humidity of Oregon for the next six weeks. I have replaced the thermistor, circuit board and heating element and have installed four fans on the back of the refrigerator and four inside the refrigerator and we still have considerable swings in temperature of the fridge from 28-42 degrees. The temperature really seems to go up when we open the fridge for only a matter of seconds. I am at a loss as to what to do next. I've tried everything I know to do and the fridge is only just over 2 years old. Any other ideas would be much appreciated.