Originally I thought the problem was airflow since the refrigerator was packed with Thanksgiving leftovers. After defrosting the evaporator and air passages the problem came back (found some great how-to videos on Youtube). So, I went to my local parts house Saturday morning to buy a new temp sensor and the ice tray that had cracked over the years. They did not have either in stock. the temp sensor would arrive Tuesday but the ice tray would take 2-6 weeks. After I got home I logged onto https://www.appliancepartspros.com/ to find the parts significantly cheaper and they would both arrive at my house on Tuesday. Tuesday came and I had both parts installed before the local parts house called me to say the temp sensor was in and I could come to pick it up. It is now Friday and I am happy to say the refrigerator is working perfect and the local parts house can put their part in stock.