As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ATL/MEI - FLT 7768 - EN ROUTE, LOST GREEN HYDRAULICS. CREW DECLARED AN EMERGENCY AND RETURNED TO ATL WITHOUT FURTHER INCIDENT. ATL MAINTENANCE REMOVED AND REPLACED THE LEFT ENGINE DRIVEN HYDRAULIC PUMP. OPERATIONAL AND LEAK CHECKS WERE GOOD, AIRCRAFT RELEASED FOR FURTHER SERVICE. (X)