I need help from the beeb experts. We live in a 3 bed 2 bath ranch built on a slab in 1974. Starting this morning I can hear water running through pipes but there are no Wet floors or water around the 2 outside faucets. I am worried we have water leaking from copper pipes in the foundation and into the soil below. I did just notice a warm spot on our tile kitchen floor but there is no water to be found. Any suggestions on where to start this process? I have already checked to be sure the toilets are not running or leaking and I have shut off the water valve for the whole house. It has been 15 to 40 degrees here weather wise but I highly doubt any problems from freezing.