Performed AC cool check. Checked electrical, mechanical, safety and performance of the system. The clip that retains the screw for the evaporator door had fallen out and was allowing air to leak. The clip was replaced, and the door was secured to the air handler. The insulation around the suction line was worn and torn so we replaced that insulation. The condenser coil had leaves removed and was cleaned. The drain line was cleared and treated. No other major issues were found, and system was running at the time of departure.