Really bad news about our Trail Lite

The RV repair shop we use is not a dealer. We are not in Florida but coastal SC. We had the roof checked last spring and we had it checked again last week. The technician said mold, but it is more like mildew all over the interior. We live on the coast of SC and we had 3 weeks of rain in October and a wet November.

Thanks for you thoughtful replies about repairs or what can be done and if anyone else has had a similar problem with a Traillite.