Nothing runs under the floor in the foam everything is either above the floor or completely underneath. To access the shower valves did you look for a panel in the pantry? Also it could be the water line running up to the ice maker which you should be able to see behind the furnace, just remove the grate under the fridge. Also you could pull the false bottom under the vanity to check there. Have you checked the lines under the sink, I had one of those come loose. You can reach them with the kitchen slide in, by the bathroom wall.
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