I am in the same boat my actuator is not fully sealing in recirc mode causing a wind noise. Haven't had time to give a good look at how much has to come out but from what I saw when I diagnosed the noise it wasn't pretty. Its getting hot around here so I will have to make time to fix it soon. Hopefully in the mean time someone who has had the dash a part can chime in on how much has to come out to access it.
Only diagram I found in my limited search