i had a leak at the front roof air conditioner. if you take the trim piece off the bottom, then there is a metal frame that has a small i think 10mm or so bolt in each corner. it acts like a clamp from the inside to hold down the roof ac with only a thick foam gasket as a seal on the outside. the first thing to do is to tighten those bolts to see if the additional pressure will stop the leak. mine did not. so i got a new gasket, but before i put it on, i just took the bolts out, pushed the ac up from the inside and put some silicone on the seam of the metal roof where it was leaking and gooped it up. not elegant, but it ended up stopping the leak.
i would get on the roof and do the same for the vents...just exterior grade silicone.
windows should be easy as well. you could gently and carefully silicone aroudn the outside frame and on mine i took the inside trim frame off to make it easier to wallpaper. you can see the frame in the wall then to see if there has been water leaking or not.
the roof on mine is all metal, so not sure why you would need to seal it. only where things penetrate the metal roof or the seam down the metal can there be any leaks. those are easy to seal.
tom
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