I've wondered the same thing, but haven't looked into the issue.
Since completing the repair on my Lippert about six weeks ago, I've had the coach out three times and the slides work way better than they did before. It think mine was leaking for a long time before I knew I had the problem.
Lippert did fine by me, but it did take them a while. And, of course, mine was still within warranty.
How is it one careless match can start a forest fire, but it takes a whole box to start a campfire?
Dan & Linda, 2008 Camelot PDQ, 2008 Jeep Wrangler