I got this from a past thread if anyone thought they could use it.

SHOWERS WITHOUT TUBS:
: Metal pan present under the shower stall - monitor for future leaks. Shower stalls showers often have metal or plastic shower pans under them to catch leaking water. These pans are known leak hazards since they crack and rust out. These pans are 95% hidden from home inspectors once they are installed. Monitor stand up showers closely, check for leaks in the grout and caulking regularly.

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Dave