When I exit the Model S and lock the doors, I can hear the AC and various fans slow and shut down. At the end of that "power down" cycle, I hear a slight clanky/knocking sound. It's like a fan blade clipping something as it comes to stop. I've had my car in and out of clear bra, tinting, and paint/body shops (the last one to fix factory defects) since delivery that I can't tell if the noise is new or not, but intuitively it seems like it shouldn't happen. I'll try to post a video with the sounds tomorrow, but any thoughts from the experts here would be great. Thanks.