Did a maintenance on a Goodman gas furnace. During the maintenance I clean the flame sensor, also cleaned out the burner box and the blower motor housing. Checked amps on the inducer motor and blower motor which both me to furnace specs. Changed out the 20 x 28x 4 pop-up filter. Also cleared out inducer port. System is operating properly at this point. I will be recommending a new expansion tank for the water heater because it has failed. M# GMEC800804BNAA s#1908095594