As a former 3rd generation master mechanic in the installation of ceramic tile, marble, granite and stone everything bama1971 has posted is 100 percent correct. I've torn out hundreds back in the day and the majority of shower pan failures are do to improper installation of the pan or wear in the case of old lead or felt pans. But those took a longer amount of time to leak due to the mud set over metal lathe that was the common method before backer board and bag thinsets. The old method would also put you in an early grave but it separated the artisans from the jack legs. Not many know how to work a hawk and trowel much less ever seen one.

Also insurance may cover it but the adjuster will determine that based on his field inspection. If he determines it failed due to poor craftsmanship and not a product failure then you are SOL.