This job I did a leak troubleshoot for homeowner, the homeowner has a mysterious sound that he says he only hears when he runs plumbing upstairs. We tried to re-create the event. There is no sign of a leak anywhere no sign of water no sign of water spotting underneath in the living room. No temperature variance anywhere on any surfaces. There is no indication of a leak anywhere on the main or supply piping water bill has not increased whatsoever. I detected no sign of a leak.