Blend door noise?

This has been driving me nuts lately.. whenever the blend door is moved I get a weird rattle. It's not extremely loud but noticeable as long as the music isn't loud.

Is the blend door actuator below the white gear? I've never worked on anything like this before..

Is this normal? Any ideas of what it could be? How much more work would it be to remove the actuator ? Kind of hard to tell at this point