The last valve adjustment the mechanic replaced the hose clamp that holds the air intake to the air box and left the screw mechanism in a 12:00 position directly under the bottom of the tank. After a few thousand miles vibration and contact with the tank eroded a pinhole in the tank.
I had performed a fuel filter mod on the bike at 95,000 while in Alaska. While doing the mod I reused the gasket holding the fuel pump to the tank so I thought this was the source of the leak. After replacing the gasket the tank still leaked. I pulled the tank off again and found the very tiny leak. I then discovered the cause by comparing the shape of the bare metal at the leak to the fresh wear mark on the clamp near the hole. I patched the hole and turned the clamp about 30 degrees away from vertical.
You can see the small V shaped wear mark in the underside of the tank and the fresh wear mark on the hose clamp bracket.