As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB THE FLIGHT CREW GOT A "HDY SYS 1 LO QTY 7 HDY SYS 1 FAIL" MESSAGE ON THE EICAS. AIRCRAFT RETURNED TO IAD. MAINTENANCE INSPECTED AND FOUND THE NLG DOOR ACTUATOR HYD HOSE LEAKING. MAINTENANCE REMOVED AND REPLACED THE NLG DOOR ACTUATOR HYD HOSE. SYSTEM LEAK CHECKED GOOD.