Alan,
Based on the one photo, I would suspect some combination of 3 sources: the main traveler, the wooden eyebrow trim, and the lazarette. When we bought Paperbird, we had extensive water damage throughout due to the eyebrow leaking. The fix was actually not too bad, removed all the upper wood paneling and replaced it with Komatex (a pic sign material that’s easy to work with). Brightened up the interior quite a bit. Also had to pull down the headliner over the bunk and replace the insulation there as it was soaked from a leak in the lazarette. The drain plugs just needed rebidding and so wasn’t hard to fix either.
Good luck!
Greg Long
Author, The New Game Changers: Driving Performance by Focusing on What Matters
Paperbird - Pearson 422
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But if not…