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It seems that I'd have to prove to Ford that they broke on their own and were not damaged by rocks / a vandalism and it's extremely hard to prove a negative.
All they tell me is, "We've never seen this before or any reports of it."
Had the same problem on my 16 and now my 17. Dealership had an extra set sitting around so they installed for me on my next oil change but in no time they cracked again. My buddies 16 did same way. I believe bulbs are getting to hot