Furnace clean and check. Cleaned the flame sensor and burners. Checked the draft inducer motor, (2) 2" pvc flues pipes, ignitor, gas valve, limit switches, pressure switches, circuit board, and the blower motor. Checked the humidifier. Changed the #35 water panel. Found the water line into the solenoid valve loose, leaking water. Tightened the line fitting, no more water leak. Advised customer to change the filter. Everything is working at this time.