Performed A/C tune-up on a Lennox straight cool system. Checked the electrical, mechanical and performance systems of the unit. Cleared, cleaned, flushed and treated the drain line. I replaced the high voltage wire nuts with a Wago wire connector. Adjusted the airflow on the system. Washed the outdoor coil and secured the compressor wiring. I also closed off a supply register slightly so the customer is more comfortable in the room by the garage. I did find the outdoor contactor is pitted. No other issues were found. The system is operational at this time.