Here is something I found on AppliancePartsPro written by Jon D. • Altamont, KST: There was frost buildup on the floor of the freezer compartment, indicating the refrigerator was failing to self defrost. I manually cycled the defrost timer, which was located on the rear of the refrigerator. After about twenty minutes the compressor came back on, so the timer was working. I then unplugged the fridge. Removing the contents and manually defrosting the freezer was the most time consuming part of the project. I then removed the three screws through the metal plate between the freezer and refrigerator doors (one through the hinge, one on the side opposite the hinge, and the third on the underside of the plate). Gently pry the metal plate from the side opposite the hinge, disconnect the two wires, and slide the plate out from behind the hinge. The freezer floor can then be worked over the brackets that held the metal plate and pulled straight out of the freezer. Gently lift the slab of foam board off the evaporator coils (I had to do more defrosting before it would lift from the coils). Once these parts were removed, I was able to thoroughly defrost the coils using a hair dryer. After disconnecting the spade terminals at both ends of the heater, a quick check with an ohmmeter showed the defrost heater had failed. Remove the retaining clip from the middle of the heater and carefully lift the heater from the coils. Reverse the process to reassemble the refrigerator.