As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FRA - CREW REPORTED POSSIBLE FUEL LEAK APPEARED TO BE COMING FROM THE FUEL CAP ON THE LEFT WING. NO NOTICEABLE DIFFERENCE IN THE FUEL QUANTITY BETWEEN THE LEFT AND RIGHT TANKS. FLIGHT LANDED FRA WITHOUT INCIDENT. REPLACED LEFT WING OVERWING REFUEL CAP ASSEMBLY. SYSTEM GROUND CHECK NORMAL OPERATION.