It sounds like the last two Lance campers I just looked at, one was a '97 945 11'3" and the other '98 1110 11'6". It also happened to the '92 Caribou we had for 23 years. I don't think a leak was responsible on any of these campers, but from water splashing up underneath while driving in wet weather over time.
The Caribou had aluminum skin so it wasn't a problem to remove it to get to the wooden frame and replace the damaged parts. Damage to it was pretty severe and required rebuilding the entire rear structure. I think damage to the Lance's may have been limited to just the "wings", but since they weren't mine I didn't explore further.
I'm assuming the damage is external and limited to the inside of the "wings". I have never repaired only this part, and have never worked on glass sided campers, but I can't see why it wouldn't be possible to just remove the plywood from the inside of the "wings" and replace it with some good marine grade plywood by gluing with waterproof glue and clamping. If it were me I would also remove enough of whatever is in the way to be certain there is no structural damage. I would also try to avoid removing the glass "skin", if possible.
Best of luck with it.
Steve
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1994 30' Monaco Dynasty, 5.9 230 HP Cummins, MD 3060, 1992 Geo Tracker.
1996 Dodge Cummins 2500 with 1996 Lance 945 camper
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