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Has anyone ever experienced this? I have no idea what it could possibly be.
Mine did something similar. I have a 2010 and I tried to have it replaced under warranty. Ford told me it was wear and tear. I think mine happened from going through car washes.
My post from 5 years ago has pictures of my b pilars passenger side only.
I gotta think it's a reflection thing. I've seen vinyl siding on houses melted by the sun reflecting off a window. The window was slightly concave shaped and focused the sun similar to a magnifying glass. Hit the whole thing with a heat gun and see if you can even it out.