As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER RETURNING FROM A FLIGHT, THE PILOT REFUELED THE ACFT. WHEN FUELING WAS DONE THE PILOT RETURNED THE FUELING NOZZLE TO THE TANK. WALKING BACK TO THE AIRCRAFT THE PILOT THEN NOTICED FLUID UNDERNEATH THE ACFT. THE MECHANIC WAS CALLED IN AND UPON FURTHER INVESTIGATION IT WAS FOUND THAT THE HMU UNIT ON THE NR2 ENGINE WAS LEAKING FROM A SEAL THAT WAS BEYOND THE MECHANICS MX LEVEL. THE HMU UNIT WAS REPLACED. NO FURTHER ACTION WAS REQUIRED.