As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, GEAR AND FLAPS CHECKED UP, NR 4 HYDRAULIC SYSTEM QUANTITY INDICATION ILLUMINATED. CREW FOLLOWED COCKPIT OPERATING PROCEDURE AND RETURNED TO NRT. REPLACED RESERVE BRAKE SELECTOR VALVE AND PERFORMED LEAK CHECK. CHECK WAS NORMAL AND AIRCRAFT RETURNED TO SERVICE.