While non-electrical causes are most likely, an impressed DC voltage (from nearby corrosion protection systems, telephone system, etc) could cause such failure in copper pipes. This can be ruled out by measurement. We have also seen lightning and accidently applied high voltage to the ground or nearby neutral conductors result in leaking copper pipes.
If there is a defect in installation as seems most likely, the owners should sue regardless of limitations, as deliberate or gross negligence is likely to result a decent selttlement in any case, if the plumber has any resoures. Just get a really good lawyer. Tom Smith, P.E.
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