If I understand correctly, the culprit could be the sealing tape that runs across the top of the slide roof. That can deteriorate with time, particularly if you don't have toppers. A solution would be to strip off the old tape, and replace with eternabond tape. One of the outside seams on the edge of the slide could also have a leak at the top of the slide, and the solution would be to pull the seam away from the slide edge and recaulk.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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