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. Blower motor wire harness has oil residue on it. Blower motor is showing signs of potential failure. Inducer motor is making excessive noises, sounds that the bearings are failing. System is now 10 years old. May want to start to plan for replacement due to age and condition. Average life span is 10-15 years.