Both of our vents had started to have a small leak in a front corner. Fortunately it was very light rain. I was able to cover the worst one with some plastic and some small rocks to weigh it down for the night. It justified my purchase of a collapsible ladder 2 years ago for getting up to the roof. The following day I looked up there and saw that pressing down on the plastic sheeting that passes for a roof outer layer on this earlier model exposed gaps in the factory silicone sealing around a fair bit of both vents. I've smeared more silicone all around both vent edges and it seems to be holding. Should survive for rest of trip, hopefully, and I'll probably then re-do the whole lot myself and probably a lot better than they did. Their silicone didn't bond well to either the roof or vent plastic's. Toilet/shower vent and TV antenna mount look OK but can't see enough under airconditioner to check it. Not enough time down here to have a Dealer do it and not sure about Dealer back home.