As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUEL VENTING OUT OF THE LEFT WING VENT BOX AREA. RIGHT SIDE OK. NO TANK OVERFILLED LT ON. APPROX 1600 LBS VENTED. AFTER BLOCK IN FUEL LEAKING OUT OF LEFT FUEL VENT BOX DRAIN. REMOVED AND REPLACED CLIMB VENT FLOAT VALVE IAW DC10 M/M 28-12. ALSO REMOVED AND REPLACED VENT BOX CHECK VALVE PRECAUTIONARY PER 28-12.