Arrived on site to perform a one system maintenance. Indoor, changed the filter and cleared the drain line. Checked electrical connections, amp draw and, capacitance. Found run cap reading low, all ductwork in the attic is r-6 and the system has a dirty blower assembly. Outdoor, cleaned condenser coil and checked refrigerant pressures, found them low. Checked electrical connections, amp draw, and capacitance. Found dual run capacitor reading low and the unit has a burnt and pitted contactor. The unit is operating, but outside manufacturer specs.