During scheduled furnace tune-up on 22-year-old American Standard FRP system, discovered cracked heat exchanger at crimp location. Carbon monoxide test revealed elevated levels at 16ppm. Documented damage with camera inspection shared with homeowner, completed 911 form due to safety concern, and provided replacement options for heat exchanger or complete system. Gas pressure measured at 3.3 WC with no adjustment needed. Homeowner opted for temporary gas leak protection (TGL) while considering replacement options.
