Completed furnace, maintenance and inspection. I checked amp draws and tested components. I tested airflow and temp splits. I cleaned flame sensor and wiped down furnace. I checked for carbon monoxide and inspected the heat exchanger with a camera. Furnace is operating within manufacture specifications, and there were no sign of safety issues. Furnace is 28 years old. Blower motor starts a little slow but once it’s up and going, it runs fine. No other concerns at this time.