As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED A NR 1 HYDRAULIC LOW QUANTITY AND A ENGINE NR 1 HYDRAULIC PUMP FAIL MESSAGE ON THE EICAS AFTER TAKEOFF.THE AIRCRAFT RETURNED AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED AND FOUND THE NR 1 ENGINE HYDRAULIC PUMP LEAKING BETWEEN THE PUMP HOUSING AND VALVE PLATE.THE PUMP WAS REPLACED AND OPERATIONAL CHECKS WERE GOOD.