Performed single system cooling maintenance. I checked amps, cleanliness, drains, ducts, electrical components, electrical connections, and refrigerant. The system is performing to manufacture specifications. I performed some work, while on site. I reconnected a supply duct, flushed the drain with a treatment, and sealed the supply plenum. I reviewed the pictures with the customer after completion. Repair the duct Seal the plenum Complementary drain treatment