Virgil;
when it rains it pours....
tape your volt-tic on & to the pipe, or position whatever meter you have to read the 35V, then start flippin' breakers. At least you may find the offending circuit , as it may be some rx simply making contact with a pipe anywhere. If your luck enough to make good on this, a point to point check on said circuit may be needed to reveal the culprit.
