As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: GREEN HYDRAULIC RESERVOIR LOW LEVEL ECAM MESSAGE ALONG WITH #1 ENGINE GREEN HYDRAULIC SYSTEM PUMP LOWER PRESSURE MESSAGE. AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED ORD WHERE IT LANDED SAFELY WITHOUT FURTHER INCIDENT. MAINTENANCE SERVICED THE GREEN HYDRAULIC SYSTEM AND ACCOMPLISHED A SATISFACTORY LEAK AND OPERATIONAL CHECK PER AMM 12-12-29 AND 29-00-00-280-006.