As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AIRCRAFT LOST NR 1 HYDRAULIC SYSTEM FLUID AFTER FLAP RETRACTION DEPARTING MAD. FUEL WAS DUMPED AND THE AIRCRAFT WAS RETURNED TO MAD WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE NR 1 ENGINE LT ENGINE DRIVEN PUMP PRESSURE LINE TO MANIFOLD RUPTURED. THE PRESSURE LINE WAS REPLACED, THE NR 1 HYDRAULIC SYSTEM WAS SERVICED TO FULL. THE NR 1 ENGINE WAS RUN AND NO LEAKS WERE NOTED.