Cleaned & checked gas furnace. Inspected heat exchanger & flue venting. cleaned burners & flame sensor. Checked voltage & amp draw of motors. Replaced air filter. Test capacitor. Found blower run capacitor weak: 13%low. I checked warranty status through Lennox pros.com: 5 year warranty. Part is out of warranty. Replaced capacitor and tested amp draw. Blower: 3.9A . Inducer: 1.1A . Gas pressure: 3.4inches water column. Temperature rise: . Supply: . Return: . Suggestions: replace thermostat batteries.