As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED CENTER HYD QTY LOSS FOLLOWED BY CENTER HYD SYS PRESSURE EICAS MESSAGES. EMERGENCY DECLARED, FLIGHT LANDED WITHOUT INCIDENT. ACFT REMOVED FROM SERVICE. FOUND NR 4 SPOILER ACTUATOR FILTER PLUG LEAKING. REPLACED O-RING. SYS GROUND CHECK NORMAL OPS.