Arrived to the home for a mystery leak somewhere from the upstairs laundry room. Client has had multiple companies out including roofers, plumbers, and dryer vent specialists to try and find the leak. Client had cut many holes in the upstairs bedroom and a small hole on the first floor to fine to leak. I was able to see the copper risers for the washer box from the bedroom and they were all dry. I advised to the client to let me first cut a hole below the riser to see if there are any other leaks. After cutting the hole I discovered the hot side riser was very corroded while the cold was fine. I asked the client if they have had any work done in the bedroom recently. They advised me that they had the flooring done about 4years ago. I then let the client know to let me cut and removed the corroded riser to see if there is a pinhole or anything of the sort. Turned off water to the home. Drained down the system. Cut out and removed corroded pipe. Discovered that a finish nail had penetr
