Arrived at location on 2/28/22 - Unit running @35 degrees, evaporator not froze up, checked pressures and unit low on charge 74 degree super heat. Used electronic leak detector and found unit was leaking out of king valve. Charged system with 404 a refrigerant and achieved 12 degrees of super heat. Sealed king valve and used eld and bubbles too assure no more leak at king valve. System is down to 11 degrees and dropping.