2018 Trane XR80 standard efficiency gas furnace running in good condition. 16x25x1 air filter in new condition. Clean flame sensor and check ignitor. Visual inspection of burners. Test blower capacitor. 7.5uf capacitor reading 5.8uf and is out of spec. Replace out of spec 7.5uf capacitor with new Turbo 200 universal capacitor. Includes 5 year parts warranty. Humming noise previously mentioned could have been caused by stress from the blower motor due to out of spec capacitor. Test ran operation in heat mode from thermostat. Temperature rise is within specs. Blower and inducer motors tested within range for Amp draw. 4" galvanized B-vent in good condition and no sign of leaks. 0PPM CO detected during testing. System is operating properly, efficiently and ready for Winter.