My BIL had a 2006 23B, but never experienced any leaks around the slide. He did however have an upper seal go bad on the HTT's front fold-out panel.
Moisture leaks can have many root causes, so until you can find where the moisture is getting in the recommended fix is difficult to comment on.
If the root cause isn't obvious, I would take a garden hose (with slide closed) and run water over the top seal area. Also, if you had a hard blowing rain check around the window(s) and the slide's vertical edge seals.
With the slide opened, check along the top edge slide roofing material seam, there is usually a 2"-4" wide piece of adhesive tape running the length......, check for any compromises.
I would also check the slide interior ceiling/walls for any signs of moisture, may help in narrowing down the possibilities.
Just thinking out loud.
Bob
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2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)
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