Performed maintenance on 90 percent furnace. Cleaned condensate trap of debris as well as flushed lines. Cleared pressure switch hose lines. Checked gas pressure in both stages, both testing within factory range, changed filter upon customer request, checked amp draws of inducer as well as blower, both tested well within range, check blower for debris on wheel, found very little. Igniter and flame sensor both checked within factory range, burners were clear of debris, electrical wiring was secure. Furnace operates well at this time