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When I arrived, performed room co test. House had been aired out for about 30 minutes when I arrived. After performing room co test for about 20 minutes, found no co in the house. Turned on furnace and performed combustion test in exahaust pipe. Readings came out ok. Put combustion analyzer probe in the duct work and was picking up up to 5 ppm in the duct while furnace was running. Shut down furnace and called homeowner about findings. Told him that there has to be a crack in the heat exchanger in order to have co in the duct work. Shut down furnace and let our office know situation. Recommend replacing furnace and a/c together due to age of the system. Also performed combustion test on water heater also, checked out ok.