Thanks for that info. What it basically seems to say is that I might have problems with the lining in a couple of years and need to replace the cooler, or so it seems. Obviously not ideal as that's the single most expensive piece, but if I can get 5 years out of it, I'll be happy. I suppose it depends on how much it's used.
My cooler lining warped, but DID NOT crack, on my first batch. It has a raised 1" lump from the bottom to the top, about 1.5" wide. I've done about a dozen batches with it since, and it works fine. It may be giving me cancer, but it makes some good beer, so it's a bit of a trade off.