Removed and cleaned and reinstalled flame sensor Removed and cleaned and reinstalled gas burners Checked gas outlet pressure Checked igniter Checked filter Inspected and tested inducer motor and blower motor Removed and cleaned and installed the condensate trap Furnace working well at this time. Slight water damage on base of burner cabinet from condensation air inlet Recommend whole house humidifier from conversation with homeowner Please renew tuneups to maintain your warranty