This won't be much help, but I had an older FR Flagstaff. Was 2nd owner so no warranty or recourse. Bottom line it had previous water intrusion, had no slide cover (since added). In simplest terms problem with design, construction, and material. The aluminum framed opening is made approximately 4" bigger per side than the actual slide, for slide install purposes. Then "filler" strip made from cheap particle board were used on each side, then laminate fiberglass skin over it on exterior, and panel on inside. They rotted and resulted in no structural integrity and it flexed the exterior skin and eventually cracked. Huge job to fix, did it myself, removing all, replace with real wood filler (milled 4" each side" ) attached to aluminum stud wth straps then re glued paneling and exterior skin. Was a bear of a job.. may not help but gives you a starting point. If that is the case with yours, this is the only way. Patching, glueing, or anything else won't work cause the wall is flexing in and out when slide operates against the framing. Once it cracks it will keep cracking. I stop drilled the skin and glass patched it. Like new, and never moved again.
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