Additional info: customer says that the freezer side of this unit got very warm and everything in the refrigerator side froze. I ran a diagnostic procedure that I found online for a similar model whit the same control panel and everything passed diagnostics. Customer said this first happened last October and then again this past week. He stated that the first time he defrosted the unit and checked the defrost heater which was good and plugged the unit back in and it worked fine till last week. Thanks again for any advice.