Rodknocker, Mine had a leak, turned out to be that mfg ran the roof EDPM material UNDER the rear cap instead of over it. I removed the metal trim, caulked, placed Eternabond over the cap to roof joint, then replace the metal trim piece. No more leaks. Don't assume the mfg installed anything 'right'. Hope yours is simple as a clearance light. My roof leak rotted the floor in the slideout, there was no evidence of water running down to the floor until one rainy day I looked from underneath the trailer at the gap between the rear cap and rear wall; water was running down the wiring and finding its way to the floor. I think I've seen it all now!