After many years, I am getting the old Safari ready for my future retirement. I found a leak coming from the Fan Tastic Vent on the front of the trailer. When I installed the vents (flat vent on curved roof) I laid down a thick bead of Vulkem and tightened center screws then outer screws less tight. Worked fine since 2014, now the whole frame has cracked at front center and rear center. So, now to solutions, buy new fans (still flat fan on curved roof); second option is to drill small holes in cracked flange and fill with epoxy as flange is now curved to shape of trailer. Well, does anyone have ideas or suggestions on what to do moving forward.