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Heat tune up on Trane XR90 Furnace. 75F temp rise. Cleaned flame sensor, inspected Hot Surface Ignitor. Blower capacitor reading within spec. Unit drawing 7.25 amps. Replaced 16x25x1 filter. Combustion test proves integrity of heat exchanger and efficiency of furnace. Homeowner was concerned with whistling noise; adjusted manual bypass damper to resolve. The system is operating well at the time of this maintenance /tune up.