Furnace precision tune up; clean and tune up furnace, clean burners, test ignition components, adjust gas level, test safety circuit, check indoor motors, checked all electrical components, tested indoor airflow, checked heating temperatures, and tested overall furnace function. Upon inspection found that both motor boosters are out of manufacturing range. Once out of manufacturing range it will start to do damage to the system. Also found upon inspection, that there was heavy rust and corrosion on the burners, tried to clean as best as possible but was still heavily rusted. Due to age and condition of system, replacement is recommended. Jacob w will be meeting with you on Nov. 1st at 5pm to go over system replacement.