As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. EMERGENCY DECLARED. LANDING UNEVENTFUL. DURING APPROACH RECEIVED A LEFT HYDRAULIC QUANTITY EICAS MESSAGE ACCOMPANIED BY ILLUMINATION OF THE LEFT RESERVOIR ANNUNCIATOR. MAINTENANCE FOUND THE LEFT RUDDER AND ELEVATOR HYDRAULIC SHUTOFF VALVE O RING LEAKING. REMOVED AND REPLACED O RING IAW AMM 27-23-01. LEAK AND OPERATIONAL CHECKS NORMAL.