The other day after taking a shower, I found water coming from the shower to the floor of the kitchen. After checking all the lines and behind sliding door I found it. It was the shower floor drain seal under the shower pan. Apparently the gasket seal below the pan failed and water was running everywhere. Problem fixed after a few efforts due to the heater duct and position of the drain fittings. So, if your shower is leaking, look in the belly under the shower pan. Hope this helps others for locating.