Performed AC cool check on four systems. Checked the electrical, mechanical, safety, and performance of the systems. I cleared the condensation drain lines and flow tested the drains with water. I also treated the drain lines. The system for the downstairs did not have an access port to clear the drain line. The condenser unit for the downstairs had a failed capacitor. The system for the master bedroom has a condenser fan motor that was leaking lubricant. The system for the living area was low on refrigerant. I performed a leak check and found a leak in the evaporator coil. The secondary pan was also rusted. Options for repair were presented to the homeowners. They chose to have the capacitor and condenser fan motor replaced and to have the living room system charged with refrigerant. I replaced the capacitor and condenser fan motor and charged the living room system to the factory specification of 7 degrees sub cooling. I function tested the systems. All the sy