Got up on the roof the other day to due my yearly cleaning. Bad news was walking around the back A/C and just forward of the it I found that the deck under the membrane was soft. Almost fell through. So, went inside and saw that it was leaking on the celling first time I have seen anything like that. So I called around for a complete roof and was glad I was sitting down. RV Roof Repair in GA want 10 K to redue the whole roof. Have called Grand Design about it and they want me to go through my dealer because I think it has been leaking since day one. I have a 2016 303 RLS and been doing the roof every year. The bad part is that there is no lap sealant to leak around the A/C.