Performed ac diagnostic on unit found system low on refrigerant. Inspected system for refrigerant leaks, no oil stains or residue. Charged system with client supplied refrigerant. If problem consists will need to dye system with uv dye to try and find leak Po 50-307 Need to properly charge system. Checked system for big leaks everything looks ok. No oil stains or residue. Properly charged system see before and after photos.