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I took my 2014 to the dealership for maintenance. When I dropped it of the headlights were fine. When I go back a couple days later to pick it up, both headlights had a lot of that "microcracking". More than in your picture. I showed it to them and they look at me like I am crazy. And I know I look crazy or stupid because that should occur over more than a couple days. Of course I can't prove anything and they want to sell me new ones for $1600. To this day it is still a mystery to me and am still pissed about it.
Unfortunately the yellowing is from UV damage from the damaged clear coat and the plastic is permanently yellowed. You can wet sand and re-clear coat the light but make sure that there is always uv stable clear coat or it will yellow within a day or so in a sunny day.Mine has the yellowing but not crazed like his.
I tried polishing it, but it’s still there
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