Arrived at location on 1/26/23 - On site for walking cooler not holding temperature , up on arrival checked in With person in charge found temperature at 55f got security to open telephone room that’s the access door to rooftop, checked my pressure noticed unit was low on refrigerant, proceeded to charge un added 6 Lb of R-404 checked unit for leak no leaks found unit dropped temperature to)39f picture on saved attachment unit fully operating