Performed a/c tune-up on a Carrier straight cool system. Checked the electrical, mechanical and performance systems of the unit. Cleared, cleaned, flushed and treated the drain line. Cleaned the exterior of the furnace and washed the outdoor coil. I corrected the airflow of the system and found the static pressure of the system is at .83 total static which is higher than recommended by the manufacturer. No other issues were found. The system is operational at this time.