As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON TAXI OUT FOR DEPARTURE, THE GREEN HYD SYS DEVELOPED A LEAK. HYD FLUID WAS SPILLED ONTO THE TAXI WAY. THE ACFT NEEDED TO BE TOWED BACK TO THE GATE. RESOLUTION NEW BRAKE LINE INSTALLED IAW MM 29-00-00 BRAKE BLED IAW MM 32-42-00 EDP CASE DRAIN FILTER CHG IAW MM 29-11-43.