I think what Thor is meaning is that you have 90 days to get it repaired, not a 90 day warranty. They want to make sure that the leak does not continue to cause damage to other items if you take your time getting it repaired. Like insurance, once you see a leak, you must act quickly to minimize further damage... (or similar wording below)....
" Don’t wait for an insurance adjuster before you start making temporary repairs. Leaking roofs should be fixed right away so the insurance company cannot dismiss some claims as the result of waiting too long to do so. "
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