Performed diagnostic on system 23 yr old Goodman condenser. Found system low on refrigerant. Charged system with one pound, numbers got better. Just out of range need to add 2nd lb. added second lb of refrigerant and reinsulated lineset to condenser. System running ok at this time. Checked electrical and capacitor ok at this time. Client informed me there might be a leak in attic at plenum no easy access to attic, wants to address leak and possibly adding ducts to 1 room when does roof.