I had the same sort of problem, although mine was leaking into my forward storage area from above the hatch. After quite a bit of searching I also discovered screws behind the vinyl molding insert trim along roof-line missing. I believe it is shoddy workmanship, and here is why. On my unit where the screws were missing, there was nothing to hold a screw. However, rather than fill the hole and make it weathertight, iit was just covered up with the vinyl trim. When water gets behind the vinyl trim (which is obvious if you remove it immediately after a rain) the path of least resistance was in through those vacant screw holes and down through the wall.
I've also had two other leaks where there was a gap in the caulking. One above my large storage locker and another above my bunkhouse slideout. It's really a shame that for the $30K+ you drop on one of these that you can't expect better attention to detail or reasonable assurance of quality. Live and learn.
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2006 Zinger 32SB
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