Check to make sure it wasn't a nail through a PVC pipe.
When I had my property management company, I managed a house where the master bedroom had a huge leak like that. It turned out to be the builders fault three years later because the builder drove a nail through the pipe when they were putting up drywall.
It just took a really long time for that leak to manifest. They were out of warranty but still paid for it when they learned it was still their fault.
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