Using your trouble shooting guide is wonderful ! After I removed the panel in the back of the freezer and melted the big lump of ice off the coils I used my VOM meter and tested the defrost thermostat (test cold) Got 2.6 ohms and the end cap looked like it had been blown out. I ordered both the thermostat and the defrost timer just to be sure. 70$ seems cheep compared to all that spoiled food. Parts delivered as promised,2 days. Working great now Thanks !