My sister had a similar leak in the front corning.
It was the marker light. When we took it apart, you could tell water had gotten inside.
We cleaned the area with Acetone and reapplied sealant.
I think we used plumbers putty to seal marker light and then added dicor to all seams in that area.
Doug
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Cape Coral, Florida
2021 Toyota Tundra SR5, 5.7 V8
2022 Jayco 240RBS
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