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Performed precision heat tune up on trane gas furnace roof top system. Replaced (4) 16x25x2 air filters. Checked all electrical conections and components. Cleaned flame sensor. Checked gas pressure. Checked belt for blower motor. Tested operation in heating mode on roof top. Performed combustion test. Roof top unit is working fine at time of service. Furnace heat exchanger is becoming rusted and corroded.