Cleaned & checked gas furnace. Inspected heat exchanger & flue venting. cleaned burners & flame sensor. Checked voltage & amp draw of motors. Test capacitor. Replaced air filter. tested thermostat batteries. Blower: 1.7/2.3A . Inducer: 0.54/1.5A . Gas pressure: 1.8/3.5 inches water column. Temperature rise: 51/66 . Supply: 145 . Return: 79 .