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 air flow, checked heating temperatures, and tested overall furnace operation. Air exchanger tune up. Checked all damper operations and cleaned and tested the inside components. Everything seems to be working at this time. Changed the steam canister on APRILAIRE and cleaned out unit. Replaced Oring and ensured there was no leaks.