Performed yearly maintenance and safety checks on 2011 Bryant 90% furnace found issue with loud grinding noise from inducer motor. Called for pricing and availability. HM9A-E Customer chose option a. Retrieved part and performed repair. found 12% o2. 35 delta t. 25 ppm co. Adjusted gas pressure 10.6%o2 5 ppm co 50 degree delta t. 105 stack temp. No concerns at this point