There may be a 20 year warranty on the new ones, I don't know, but ours had a 5 year warranty, and I called them just before our five years were up. They replaced the first leaky chamber for free, but not the current one. Actually, I should call them about the sagging head end.
I can let you know how they handle it if you would like.
Sure, passionfruit, call 'em and stand up for what's Right!