Is it just the thin vinyl covering, like a wallpaper or is it the vinyl and backing material such as a luan? If it's just the thin part like a wallpaper and you're sure the leak issue is solved, I'd do the same as if I had a bubble in some wallpaper. A sharp single edge blade, make an X so that you can fold the sections back that aren't adhered. Use a good wallpaper adhesive and apply to the vinyl and use one of those plastic smoothing tools - maybe 4" or so and gently smooth out the bubbles. Take a slightly damp cloth and wipe any adhesive that squeezes out and let it dry. You may still see the cuts from the razor blade, but the adhesive should eliminate the bubble. If it's more than just what I've described, I'd leave well enough alone. If it's into the backing/luan/whatever I wouldn't mess with it.
Trailerless but still have the spirit
2013 Rockwood Ultra Lite 2604 - new family
2007 Rockwood ROO HTT - new family
2003 Ford F-150
4 doggies - We support Adopt/Rescue.
Sam, you were the best!
Cubbie, Foxy, Biscuit and Lily - all rescues!