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Performed Precision Heating Tune Up On Lennox Gas Furnace. The 20x25x6 Air Filter was very dirty and needed to be replaced. Used a 20x25x1 Filter in its place. Used an inspection camera to inspect Heat Exchanger. Heat exchanger has significant rust along the top seams of the each chamber. Inside the heat exchanger the walls have rust spots throughout and rust along the seams. Did not find any definitive failure points in the heat exchanger at this time. Performed a Smoke Test on heat exchanger and did not detect any disturbance in the smoke when the Blower Motor turned on. Performed a combustion analysis on the furnace. Used Analyzer in duct work and did not pick up any CO readings in the Supply Air. While testing system, found Union Gas Fitting had small leak. Fitting was not tightened fully and after tightening the leak stopped. System is operating but is in very poor condition. The heat exchanger has a lot of rust forming which could cause a safety issue if it rusts through and e