Frig stopped cooling - Freezer side iced up

After un-plugging the frig and allowing it to defrost, we emptied the frig and gave it a thorough cleaning inside and outside. I then removed the shelving in the freezer and the face plate at the back of the machine. One of the defrost heater coils had burned out and there was a loss of continuity which was keeping the frig from defrosting properly. The old heater snapped out easily. I went to this website and ordered a new defrost heater assembly which arrived practically overnight. It was identical to the old one and installed as quickly and easily as the original had come out. I put the faceplate back on, put the shelving back in, placed a thermometer inside the fresh food section, plugged it in and waited until I heard ice cubes drop. The fresh food section was holding at 41 degrees F which is optimum. The refrigerator has been working smoothly every since! Easy job!