Heating tune up performed today on a down flow air handler with heat pump installed in 2019. All electrical connections are tight with no corrosion. Blower motor is acceptable. Blower wheel and evaporator coil are clean. Mild corrosion is present on the evaporator coil. Compressor and condenser fan motor are working as they should. Reversing valve and defrost control board are acceptable. Heat strips are pulling proper amperage. Outdoor unit was washed and waxed.