Not sure on the part number but my taillight on my coachmen freelander did the same thing since new. Turns out someone tightened the screws too tight and crushed the foam gasket. Foam gasket was replaced and dry ever since. If the lens isn't cracked, can't tell from pictures, replacing the gasket will be a lot cheaper. Just be sure when tightening, not to over tighten or it will leak again.
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