I watched the video on AppliancePartsPros.com first. Then determining where I would need to get at, ordered all the serviceable parts in that location. Two temperature sensors and the defrost sensor. Unfortunately, I ordered the wrong part. After looking at the diagrams more closely, I found the right part and figured I may as well replace the fan motor when I'm in there again.
AppliancePartsPros.com has helped me fix the dryer (heating element and temperature sensors),
The dishwasher (Main board and touch panel)
and one other refrigerator. I would have paid thousands or bought new appliances without their help. I keep coming back, because for a few dollars I can extend the life of my appliances way beyond expected lifespan and manufacturer warranty.