Met with Serafin, and ask if there were any issues? He responded none. Took me to the mechanical room and showed me the furnace. Opened up the cabinet, removed and cleaned the flame sensor. Checked and inspected all electrical connections. All in excellent shape. Inspected the blower motor and wheel. Also in excellent condition. Checked the return filter, and it was dirty. Serafin pulled out a new one and replaced it. Turned on the heat to the furnace and observed the unit go through the start up sequence. From inducer fan, to pressure switch, to igniter, to gas valve. Furnace is operating as it should.