I will have to call Mr. Appliance tomorrow am. I cannot find the receipt from them that listed the 3 parts. I should say that the refrigerator is warming at the same time there is ice build up on the back wall of the freezer. When you said "if the unit is warming up" do you mean the refrigerator or both refrigerator and freezer?
The ice formed again in the time after the service man left. So does that mean there is a wire problem in the sealed unit or do you think there is hope that there is something else wrong?