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The lens is perfectly smooth on the outside. It appears to be an inner lens that is cracking. Dealer agrees that there is no sign of rock damage or impact to cause the crack. Stated GM is trying not to replace a $1,000 headlight if they do not have to.On my screen there appears to be a little spot towards the bottom of that crack where it looks like a rock or a big bug or something hit it. Maybe it looks different in person but from my couch that sure looks to be caused by some type of external impact