EagleJag is there a dealership resolution to your "thud sound" (louvers closing), I'm having that same issue.
No resolution, but to be honest, I forgot to mention it when I went in for the telematics unit replacement. At this point, I'm not too concerned about it being a problem, although I am still am curious as to what it could be.
I will say that I did have to go to the dealer twice for the telematics unit issue, so the dealer certainly had the opportunity to hear the sound since it occurs each time the car is shut off. I'm assuming that if were something problematic, they would have let me know. My biggest concern was that something was wrong with the suspension, since it seemed to occur each time I stepped out of the car. But after some more careful attention, even if I remain in my seat I still hear the sound.
If I find out anything further, I will report back.