Arrived for one system inspection in attic. System is zoned with a Honeywell Zone board with 2 zones, 14" zone 1, 12" zone 12" and 10" bypass damper. There is currently insufficient flood protection with only a pan switch in place. Noticed dark markings around several screws on face plate directly in front of burners. Inspected heat exchanger which has failed with visible cracks that are documented. Tested zone dampers and zone board operation. Tested system cooling operation while taking pressure readings and amp draws. Liquid line temperature was very low at 79°on a 75° day. Saturation temperatures were low as well and condenser coil needs washing. Informed homeowner of today’s findings with recommendations. Homeowner is aware of cracked heat exchanger and will speak with his wife about today’s appointment. No repairs were made during today’s visit.