As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A LEAK WAS NOTED COMING FROM THE CENTER FUEL TANK DURING THE POST FLIGHT WALK AROUND. MAINTENANCE INSPECTED THE AIRCRAFT AND FOUND THE O-RING MISSING ON THE FUEL MANIFOLD TUBE FITTING. A NEW O-RING WAS INSTALLED, OPERATIONAL AND LEAK CHECKS WERE PERFORMED, AND THE AIRCRAFT WAS RETURNED TO SERVICE.