Performed furnace clean and tune; inspected the exhaust and intake PVC ensuring all connections were secured, removed and cleaned the burners along with the flame sensor, cycled the system on and checked gas pressures and did make an adjustment, as well as performed a combustion test verifying no CO in the airstream. Final note air quality report came back in with extremely high levels of particles in the home did take a peek at the blower wheel and found large amount of dust this could potentially cause reduction of efficiency within the sytem and I would recommend upgrading air filter to an electronic air cleaner. This system is currently operating normal at this time. Job complete