Cleaned and serviced the furnace due to the last visit on the current plan. Tested all mechanical components. Cleaned all sensors. Cleaned the exhaust pipe out. Tested gas valve voltage and pressures. Cleaned all pressure switch hoses and inlets. Replaced the furnace filter provided by the customer. Replaced humidifier pad filter.(35) tested humidifier. Flushed water heater. Found a lot of sediment in the heater, so flushed multiple times till clear water. The system is clean, heating, and operating properly at this time. Performed free inspections.