Performed the level 2 furnace cleaning. Burners and flame sensor are very worn and rusted. Heat exchanger was also rusted and I had backdraft from the powder test. Venter and blower motor bearings are starting to go. Both motors are loud upon starting. Average life of system is 12-14 years. Unit is currently 22 years old. Due to age, condition, and cost of future repairs, second opinion is recommended. Unit is currently safe to operate but we cannot conclude for how long.