Found leak stain on kitchen sheetrock ceiling below master shower. Cut sheet rock to investigate. Found no leak under master shower center drain. Found that the shower was built with a fiberglass base with tile anove it. Minimally tested the pan by pluging the drain, then barely flooding the shower base. Found eater leaking through the subfloor around where the edge of a 48x48 fiberglass base would be. Pan leak contirmed. Property Medics to come out.