As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT, RECEIVED HYD 'G' RSVR LOW LEVEL MESSAGE. AN EMERGENCY WAS DECLARED AND EQUIPMENT CALLED OUT. THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE O-RING ON NR 1 ENGINE PRESSURE FITTING. LEAK AND OPERATIONAL CHECK OK.