Homeowner signed up for service agreement. This was the first trip. TD: -17°. Tested SS2, and made sure electrical connections were tight. Installed UV light to fight bacterial growth. Cleaned the evaporator and condenser coils. Cleared the primary condensate drain line. Checked the dual run capacitor(testing in range). Checked the refrigerant levels(slightly lower than manufactures specifications). There was some refrigerant oil coming from shrader core. Tightened shrader. System is operating as it should.