Regarding In Floor Heating Cables; The GC installed the cables, I installed the T-stat on a GFI circuit and now only 1 section of cables are working(2 sections installed); The customer is not happy and wants the GC to fix it(duh); I looked for the thread about this subject and could not find it; Any suggestions on how to find the exact location of the malfunction? I did an Ohms reading(after the problem occured) and had readings between the heating cables as well as the Gnd braid; The GC claims that readings were taken prior to pour but cant remember between which wires and what the readings were(2yrs+)Any suggestions are apprectiated