As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING REFUELING. AFTER A/C WAS REFUELED OFFSHORE AT WC-560. THE MECHANIC NOTICED A STEADY FLOW OF FUEL FROM THE OVERFLOW DRAIN LINE. HE INSPECTED THE LEAK AND FOUND THE HMU LEAKING. HE REMOVED AND REPLACED THE HMU AND COMPLIED WITH A LEAK CHECK AND AIRCRAFT WAS RETURNED TO SERVICE.