New 5th Wheel-Water Intrusion-Need Advice-Back at dealer

2026 FR Campsite Elite 5th Wheel maiden voyage. Gone 40+ days. Maybe not the smartest thing in hindsight. Serious water leak. Fresh water overfilling the kitchen grey tank by itself and leaked into the bottom of the RV and seeped through the coroplast. Didn't realize the seeping until 4 days after we setup. Condition lasted over a week. Didn't receive much help over the phone. Multiple techs scratching their heads. Finally decided to leave the flush valve open. other issues: main slide never worked. Main awning detaching from trailer, Bed system unusable. Delivered the trailer to the dealer on July 14. Our next trip is Aug. 26. I demanded that the coroplast be removed to inspect plumbing issue and more importantly for MOLD. If any mold is present, I can't see myself taking possession of the unit regardless they fix all the issues or not. They can only fix what they see, and problems could develop down the road. Need some advice what to look for or what to say if/when we observe evidence of mold. Appreciate your help.