I found a forum that indicated this model of freezer was notorious for the temperature control thermostat going out. I followed the instructions and using a multimeter was able to determine the part was bad. It took about 30 minutes to remove the shelves and control panel cover, locate and disconnect the part and test. Before, disconnecting the part, take a picture of how the wires are connected for reference on the reinstall. The forum linked to the part. After reading the reviews, it seemed easy enough to replace. I ordered the temperature control thermostat (along with a defrost timer and defrost thermostat in case I had used the multimeter incorrectly). Ordered the parts on Sunday night. They shipped Monday. Arrived Tuesday. Replacing the part, replacing the control panel cover and replacing the shelves took maybe 30 minutes. Plugged the freezer in, set the temperature and the compressor started immediately. The parts and shipping cost less than a service call and the freezer was repaired three days before a service tech could come work on it.