Heating maintenance. Cleaned and serviced residential furnace. Customer renewed VIP maintenance program. One visit is being used today. Tested all mechanical components. Cleaned all sensors. Cleaned condensation trap and all hoses. Cleaned pressure switch hoses. Found ignitor and flame sensor to be very corroded. The customer agreed to replace both parts. Changed furnace filter and humidifier pad filter that the customer provided. Adjusted humidistat. The system is clean, heating and operating properly at this time. Performed free plumbing inspections. ** Bill customer. Friends with Rudy.