As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO CUN. ON CLIMBOUT GREEN HYDRAULIC SYSTEM LOW PRESSURE MESSAGE DISPLAYED. THE AIRCRAFT LANDED SAFELY AT CUN AND TAXIED TO THE GATE UNDER ITS OWN POWER. MAINTENANCE FOUND THE RIGHT HAND MAIN LANDING GEAR LOCK STAY OUTBOARD ACTUATOR HOSE LEAKING AND REPLACED IT PER AMM 32-11-22. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED.