Pkg clean and tune. Furnace clean and tune. Cycled system. Checked heat exchanger, ok. Checked and cleaned burners and flame sensor. Both ok. Checked gas pressures. Checked connections and clamps, ok. Tested levels of CO and XS air in exhaust. Both had normal levels. No CO found in airstream. System operating normal at this time. Ac. Cleared drain line. Checked indoor coil, ok. Cycled system. Checked and cleaned electrical compartment. Used coil cleaner on condenser coil. Hooked up gauges and checked pressures and temps. Subcooling and indoor coil temp are normal. Temp split was 18. System operating normal at this time. Job complete.