Completed system inspection main system need a replacement, including the ductwork system or full restoration entire furnace Electrical component got flooded, including return and supply Plenum a new filter cabinet would need to be installed cleaned evaporated coil. It has a high amount of bacteria growth install a Apco air scrubber UV light to prevent from bacteria to growing back. Second floor system has a crack heat exchanger gas connection is not up to code. Missing front panel. Cut off switch supply plan on ductwork is not enough for the CFM of the system. Blower would need to be cleaned. Furnace is from 1998. Highly recommend to replace it due to the carbon monoxide, reading and leakage Based on our findings today, it might be time to think about getting a brand new system.