Performed maintenance on 90 percent furnace, checked amp pulls of blower and inducer, both within factory specs at time of tune up. Inducer capacitor is also within range, burners are clean and free of debris, removed flame sensor and cleaned, as well as check ignition system, which tested within factory range. Pulled and cleaned condensate trap, as well as flushed condensate lines and inspected pressure switch tubing. Filter looked decent, gas pressure tested within range in first and second stage. Temperature rise between return and supple also tested within factory range, inspected all wiring for any faults, none found at this time.