Performed AC cool check on three systems. I cleared the condensation drain lines and flow tested the drains with two gallons of water. I also treated the drain lines. Air filters were clean and had been recently replaced by the homeowner. I sealed an air straw at the liquid line on the master bedroom evaporator coil. I also properly secured the capacitor for the condenser fan motor on the same system. I treated the electrical cabinets on the condenser units to keep ants away from the contactors. Condenser coils were cleaned. No major issues were found. The systems were running at the completion of service.