Hi - my seven year old Frigidaire refrigerator model fgus2632lp2 is gathering ice on the coils in the freezer section. I tested the thermostat and the heater assembly and they\'re both working. From my understanding this model does not have a defrost timer which means the problem is with the main control board. There are two control boards on the refrigerator. The first is located at the bottom of the refrigerator and it\'s a basically a fancy circuit board. the second is the main electronic refrigerator panel - the user interface panel that provides temperature information and allows for the use of the ice and filtered water panel. Not sure which is the culprit. Any ideas? Thanks!