As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TRIP NR 1127054, CREW REPORTED (HYDRAULIC VOLUME LOW-B) EICAS MESSAGE 5 MINUTES AFTER TAKEOFF. CREW VERIFIED (0) QTY ON HYDRAULICS PAGE IN EICAS FOR B SYSTEM. CREW PERFORMED CHECKLIST FOR FAILED B HYD SYS AND DIVERTED. NO UNUSUAL FLIGHT CONTROL PROBLEMS WERE NOTED. ON LANDING CREW REPORTED NO ABNORMAL SITUATIONS. MAINTENANCE IS EVALUATING THE DISCREPANCY. OPEN