As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 3730 -HYD/DE- DECLARED EMERGENCY DUE TO 'A' HYDRAULIC QUANTITY AND PRESSURE WENT TO ZERO. MANUALLY EXTENDED LANDING GEAR. CORRECTIVE ACTION: FOUND LEFT HYDRAULIC MODULAR PACKAGE O-RING LEAKING. REPLACED SAME. REPLACED LEFT ENGINE EDP AND CASE DRAIN FILTER. OPS AND LEAK CHECKS GOOD.