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. Combustion removal system bearings are failing. Flame proving system is starting to test out of manufacture range. Air distribution system is dirty reducing airflow and efficiency. Due to system being over 25 years old and the issues found, would encourage looking into system replacement. Chris will come out next week Tuesday at 1pm to do a system estimate.