As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED LOSS OF NR 1 HYDRAULIC SYSTEM FLUID. PRESSURE DID NOT GO TO ZERO. SYSTEM QUANTITY WAS AT ZERO FOR LESS THAN 10 MINUTES. CREW DECLARED AN EMERGENCY AND LANDED WITHOUT INCIDENT. FOUND LEAKING O-RING ON NR 1 HYD SYSTEM PRESSURE MANIFOLD. REPLACED O-RING.