As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW SENT ACARS MESSAGE NOTIFYING OF GREEN HYDRAULIC SYSTEM LOW LEVEL. THE LANDING GEAR WAS MANUALLY EXTENDED, AN EMERGENCY WAS DECLARED AND THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE LEFT ELEVATOR GREEN SERVO CONTROL ACTUATOR FILTER ASSEMBLY PACKING LEAKING. REPLACED PACKING, LEAK AND OPERATIONAL CHECK OK.