Performed furnace clean and tune; started by inspecting the exhaust and intake pvc ensuring all connections were secured, I then removed and cleaned burners along with the flame sensor, Next I cleared out the drain line, I then cycled the system on and checked gas pressures, lastly I performed a combustion test verifying no CO in the airstream as well as replaced the 16x25x1 filter. This system is currently operating normal at this time job complete. Dan F will be out 10/26 at noon for AC second opinion