As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HYDRAULIC QUANTITY LOW INDICATION, CENTER HYDRAULIC QUANTITY EICAS MESSAGE DISPLAYED. EMERGENCY DECLARED, DIVERTED AND LANDED WITHOUT FURTHER INCIDENT. THE AIRCRAFT WAS GROUNDED. MAINTENANCE REPLACED HYDRAULIC RIGID LINE FOR THE CENTER HYDRAULIC SYSTEM IAW 29-11-00, NO LEAKS NOTED, AND PERFORMED SATISFACTORY OPERATIONAL CHECK.