Electric W/H problem - now under slab leak???

Thanks for all your responses. We went back over there yesterday and

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Once you determine the location where the pipe enters the slab area, and where it comes out of the slab, draw a line on the slab and drill a few half inch test holes to see if the dirt is dry or muddy. Or if possible, just abandon the pipe under the slab and run a new one

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Some Menards sell a cheap moisture meter for measuring wood or concrete moisture content, where it is wettest would be the leak. If it is old copper it might be worth abandoning as acids in concrete have made many radiant heating systems get leaks. A microphone moved along the pipe area might alow you to hear it leaking
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CM wrote:

Here's a link to message board thread where a problem like yours is discussed:
http://do-it-yourself.tribe.net/thread/fc66feb5-cddf-4a77-a7ce-7b0734934abf#79547044-0141-496a-a92f-652b6e4fa945
Good luck.
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