The fact that the neighbors are experiencing the same problem points to the copper pipe. Pinhole leaks are generated from the inside out. Electrolosis would attack the exterior of the pipe more so arould the joints. Are the pinholes in the elbows? If the plumbers did not ream the pipe the water flow causes a ventury action that wears down the copper at an exponential rate. I work at UCLA in California and we had a whole new building go bad within two years of opperation. The homeowner may have to go to litigation with his neighbors against the builder/plumber. there is a statute of limitations of seven years.
good luck.
Gordon Webster Gordon Webster
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