After reviewing information from APP, I made an educated guess it was a defective evaporator fan motor. There were two motors to choose from so I watched the how-to-video on removing and replacing the fan motor. I followed the instructions (that matched my refrigerator model 100%) and removed the fan motor. It wasn't difficult but it was an involved process. Now I knew which one to order,so I did. My part arrived the next day. I followed the video instructions to reassemble all parts and plugged it in. Forty eight hours later it was cooling below 40 degrees F. It is still running perfectly.