We noticed that the tile floor was warm in one spot. We also noticed water leaking under the slab outside the kitchen. When we shut off the hot water we had neither... I'm stressing big time. We redid our kitchen just 1 yr. ago. Of course, the problem appears to be under the new cabinets and new tile. When I look for someone to fix it are there any specific questions to ask to make sure that the person is qualified and won't destroy my home any more than necessary? Hope our home owner's insurance will cover it!