Originally Posted by 1idejim
Close it off again and induce air. Make a .25 npt adapter and start with low pressure. Increase pressure as needed. Sometimes a mixture of air and water has to be used but air will surface when water won't.
Don't get in too much of a hurry to cut or dig, you'll end up with a more harmonious outcome
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great advice if nothing else, cuz air is much easier to find than water when it comes to leaks.