Refrigerator had some frost buildup by the back panel so after a lot of searching around I found that the issue could be the drain hole was clogged up. I cleaned it out and made sure that there was nothing clogging up, but that did not fix the issue. I found similar stories as mine on AppliancePartsPros site so I decided to order the three parts that may be the issue, defrost thermostat, temperature sensor and the defrost heater. After a bit more research I found that the most likely issue was with the temperature sensor, I found out how to test it and compared it to the new one by placing the sensor in a glass of ice water and checked the resistance. I replaced the temperature sensor and it fixed the problem so now I can send back the other parts as they are unused. Just costs me a few dollars of insurance (shipping back) to have the parts on hand. Well worth it considering how much a service call would have been. Biggest issue was waiting for the iced up coil to melt overnight. Very easy to replace and there are really detailed videos. Have patience with melting as you do not want to destroy the styrofoam and create a bigger problem for yourself. Don’t force it. It took about 45 minutes working time to replace and get things back in order.