Arrived at location on 11/1/21 - Found unit running at 34 degrees on arrival. Spoke to customer and they said alarm keeps going off and it is taking cooler a long time to make temperature. Checked operations and found cooler was low on charge added 2 lbs 404a adjusted thermostat running 34 to 38 degrees. Leak checked unit could not find any leaks at this time. Cooler is working ok now.