As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. MIA-BOS FLIGHT RETURNED TO GATE. DURING PUSH BACK, AFTER FUEL LEVER CUTOFF, CREW REPORTED FUEL LEAKING FROM THE RIGHT ENGINE. CREW ACTIVATED THE FIRE EXTINGUISHER BOTTLE. REMOVED AND REPLACED THE HYDROMECHANICAL UNIT IAW WORK CARD 73-94-12. OPERATIONAL CHECK GOOD.