Sounds like you need a new light shell/lens. They're not expensive. If you've never taken one off, they're like a sealed unit except for where the light bulb itself goes in. More than likely, one of the screws was too tight and put a crack in the plastic.
2013 2500 CCLB 4x4 Laramie
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2013 2500 CCLB 4x4 Laramie
Sent from my iPad using Tapatalk