As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER PUSHBACK, WITH NR 2 ENGINE RUNNING GROUND CREW OBSERVED FUEL LEAKING FROM THE ENGINE. CREW ADVISED AND ENGINE SHUTDOWN, ACFT RETURNED TO THE GATE. MX DISCOVERED THE TBV (TRANSIENT BLEED VALVE) TO BE LEAKING BEYOND LIMITS AND THE UNIT WAS REPLACED. LEAKAGE WAS ENOUGH FOR GROUND CREW TO HAVE EMERGENCY SERVICES ALERTED. MORE INFORMATION WILL BE SUPPLIED ONCE THE SHOP TEARDOWN REPORT IS AVAILABLE.