I performed a furnace tune up on a 2006 Armstrong system. The system is working but is not in a good shape. The temperature split is bad the heat exchanger is very rusted, signs that is been overheating for quite a while. I adjusted the gas pressure from 3.49 to 2.08 to bring the supply temperature from 190F to 169F. I checked for CO and there is no CO in the supply ducts. I started a furnace tuneup on 2016 Amana system but it has a bad inducer motor. I need to find and order one. I’ll comeback to finish this tuneup once I have the part. I replaced the inducer motor under warranty and performed a furnace tuneup. The system is working properly with no concerns at this. See health report card for more details