After we moved into our new home, we realized that the freezer was very cold and the fins were frosting over, and the refrigerator wasn't cold. We had to take it apart and manually defrost it about once every 8 to 10 days. After research online, we found Appliance Parts Pros videos, which clearly explained how to fix it ourselves, a savings of at least $1,000 or more, since a new one of this size would have been in the arena of $1,200 to $2000. We ordered the three most likely parts to be bad, which were the defrost thermostat, the heater, and the control board. We first replaced the thermostat and the heater, since those parts are located behind the freezer. It took both my husband and I working together to get the heater in, but we replaced these two parts first because they cost quite a bit less, so we were hoping it wasn't the $200 control board. After about a week, we noticed that the visible fins were still frosting over. In retrospect, I would just replace the thermostat and the control board first, because they are much easier to get at than the heater/evaporator, which rarely goes bad, but now all three parts are in and the refrigerator is working great. We really appreciate the videos and the live chat help which I used once as well. (And the delivery was incredibly fast. I choose priority for delivery, but the first two parts still arrived in less than 24 hours from when I ordered it online. The heater was backordered, so took a few days longer, but still was fast on delivery.)