Performed heating maintenance on a 2016 Goodman 80% efficient single stage natural gas furnace Filter very dirty Replaced 16x25x4 filter with one from truck stock Cleaned flame sensor Blower capacitor tested 20mfd (rated 20) Inducer motor making excessive noise: sounds like failing bearings Temperature rise 53⁰ (spec 35-65) Gas pressure 3.5"wc (spec 3.5) Combustion test numbers are very healthy No carbon monoxide present in ductwork during operation Furnace operating safely at this time