We have a slightly newer 2007 Four Winds 34B with same issue when we purchased a few months ago. Ended up just pulling the rubber seal out, spraying and wiping with silicone based slide spray and then pushing back in again. took some elbow grease and gentle persuasion with a rubber mallet in a few places, but ended up going back in just fine. While I was at it, unscrewed the plate on the inside of the window so the whole frame popped out and resealed with butyl tape again (on the outside window frame inner part between the frame and the MH)
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