is a great organization as is alaska airlines and your question is a very good one. one of the troubling things about maintenance is, sometimes you'll get something that's so hard to run down, you'll run every trap and every line of your repair manual and you can't find or discover what the problem is so you take precautionary measures and you heard tray and mentioned it, etops, a alaska put that limitations with it entrying over land where it could rand if something happened like this. but of all the things you could imagine as pilot having a structural problem in construction is something you would never actually think about or count on. this airplane's just a couple of months old as i understand it and this leak was actually in an area that was supposed to have an exit door in it in other aircraft and they removed that