As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE EN ROUTE, THE FLIGHT CREW REPORTED THE B HYD SYS DROPPED TO 17 PERCENT. THE CREW FOLLOWED THE CHECK LIST & SHUTDOWN & UNLOADED THE B HYD SYS. THE A SYS CONTINUED TO FUNCTION NORMALLY. IT WAS DISCOVERED THAT THE LT ELEVATOR PCU PRESS SWIVEL FITTING WAS LEAKING FROM THE O RING SEAL. SEAL WAS R & R, LEAK CHECKED NORMAL.