Cleaned & checked gas furnace. Inspected heat exchanger & flue venting. cleaned burners & flame sensor. Checked voltage & amp draw of motors. Replaced air filter. Clean and check humidifier, replace pad, checked water flow and drain. Blower: 2.6/3.7A . Inducer: 0.11/0.24A . Adj Gas pressure: 2.0/3.7inches water column. Temperature rise: 51/59 . Supply: 128/120 . Return: 69 .