Furnace tune-up and safety inspection. Cleaned and serviced the furnace according to the plan. Tested all mechanical components. Cleaned all sensors. Cleaned condensation trap and all hoses. Cleaned all pressure switch hoses. Tested gas valve and inlet/outlet pressures. The HSI was found to be very corroded and was replaced. Replaced the humidifier pad as well. The system is clean, heating, and operating properly at this time. Customer renewed VIP maintenance plan. Performed free plumbing inspections.