Kenmore Chest freezer model 25319331000 not cooling

I've been using a chest freezer as a frig running it with a Johnson Controls external thermostat. It's been working great staying at a constant 35-40 degrees fahrenheit. The past month it's started to warm up inside. The motor is running, I hear fluid in the walls of the unit. The top section started to get frosty while the rest of the unit would remain fairly warm. This unit has a flash defrost that I initiated. The front internal walls of the unit got very hot while the back was only moderately warm. I unplugged it and let it sit overnight. I plugged it in the morning and let it run all day. The unit was only moderately cool after 10 hours. The thermostat is set on 7 (max). I've adjusted it off and max several times. I hear the unit running the whole time. When I adjust it to 7 after turning it off I hear something else energize for a few seconds and then shut off.  This happened once.
Any assistance with this is greatly appreciated. My kegs are getting warm.
Best regards,
Ross