As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AIRCRAFT LOST NR 1 HYDRAULIC SYSTEM QUANTITY AFTER TAKEOFF FROM EWR. THE AIRCRAFT WAS RETURNED TO EWR WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND NR 1 AND NR 3 REVERSIBLE PUMP LEAKING AT HYDRAULIC TRANSFER VALVE. THE TRANSFER VALVE, FITTINGS, AND O-RINGS WERE REPLACED. LEAK AND OPERATIONAL CHECKS WERE GOOD.