Good test. There are two other blend doors recirc blend door; located in the passenger foot well area. Attached is a picture, the circle in red is the one I'm referencing.
Then you have the mode blend door; located in the driver's side footwell, near the gas pedal, pretty easy to get too. Circled in blue in the photo.
Pull those and see what you get. Also, keep in mind, they when you pull these and apply voltage to them, there is no load such as the blend door on them, so they may work flawlessly. But when you reconnect them, the load from the blend door is enough that the gears will bind (from wear and age) and the HVAC control module will lose communication with the blend door(s) and it will go into trouble mode (the flashing arrows).