Since the only fix I know of is complete wall replacement, it would be best to document everything, take pictures and then take the tt to your dealer. They will contact FR and see what they say. FR has been known to fix delam issues on units, even some that were out of warranty. At least give them the chance to say no.
Gary & Trish
"PT Crew Member Since 11/2010"
2017 Prime Time Crusader 315RST TE 6.0 : 2007 Flagstaff 206ST MAC Series
2012 F-250 Lariat : FX4 : CC : SB : 6.7L Diesel : 3/55 Gears
2016 Nights Camped - 9