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 IN SAN DUE TO AN YELLOW HYDRAULIC RESERVOIR LOW LEVEL ECAM MESSAGE IN CRUISE. THE AIRCRAFT LANDED SAFELY AT SAN. MAINTENANCE FOUND THE RIGHT HAND ENGINE YELLOW HYDRAULIC SYSTEM PIPE SECTION IN THE PYLON GOING TO THE HYDRAULIC FILTER ASSEMBLY LEAKINGUNDER THE B-NUT AND REPLACED IT. A SATISFACTORY LEAK/ OPERATIONAL CHECK WAS ACCOMPLISHED.