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I used one of the advisory threads (sticky's) to get mine figured out.
Order a new one, they are not hard to replace but getting the panel that covers it off is kind of "special" I ended up breaking 2 of the tabs that I wasn't aware of. Ordered a new $70.00 panel but this one isn't rattling or making noise so I have a backup when it starts.
You tube videos are also very helpful, I also looked at them.
My guess is it's the door module. Had an 05 that did the same thing. GM replaced the door module under warranty even though the warranty was long expired. I would contact GM customer service and see what they say. Can't hurt. The door module is about $250 plus labor.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.