As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, FLIGHT CREW RECEIVED HYD G RSVR LO LEVEL WARNING MESSAGE. THE SYSTEM CONTINUED TO DEPLETE ITSELF. CREW PERFORMED AN AIR RETURN. HYD LINE FOUND BURST IN NR 1 PYLON. THE HYD LINE WAS REPLACED IAW AMM 20-21-12. PERFORMED OPS CHECK AND LEAK CHECK OK.