cauncy said..
Usually it's the stitching that's given way, so it's a weak spot which allows the bladder to bulge either strut or le material, if the case get it re stitched as the is a good chance you'll split it which in turn blows your bladder
Yep, if you see the stitching coming undone along the LE where the bladder seems the herniate, that is an easy fix. You can even do it yourself.
Ideally you'd be using bonded polyester thread (same stuff kite manufacturers uses), but dental floss will actually work the same and be just as strong. Just grab a strong needle and use a pair of pliers to help the needle poke through the dacron. Use the same holes and simply sew along the area where the stitches came undone + a few cm each side of it. just be sure you're not sewing over the bladder!
It only takes a couple of minutes and will last for ages if done well.
Christian