The freezer coils pack solid with ice and the frig. side does not cool at all. Could it be part #12 the heater - temp control.
You will want to test the continuity of the defrost heater and the thermostat. If they doo not have continuity then you would need to replace the defrost heater and thermostat assembly 61006116. If the thermostat and heater have continuity then you would need to replace the adaptive defrost control 61005988.