Arrived to remedy and inoperable system. Upon inspection of the system, found it heating the home. Performed diagnostic on the system to determine the cause of the original outage. Verified operation of the ignition and proving system. Verified temperature rise. System is firing consistently and heating the house without overheating. Found that the inducer is making excessive bearing noise. Found that the damper for the upstairs leg of the system is flapping around in the ducts, despite being tightly secured in position. Continue to evaluation on the furnace and airflow system. Found that the fan inside the furnace has a healthy coating of dust debris. Without a definite cause of the systems outage could not provide a concrete diagnosis. The issues found could certainly contribute to the system outage, but without it happening in front of me, I cannot say for certain. System is functioning properly upon departure.