As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FLT, NR 1 ENG HYD PUMP LOW PRESS LIGHT BEGAN TO FLICKER FOLLOWED BY A RAPID DECREASE IN A HYD SYS QUANTITY TO ZERO. FOUND LOWER RUDDER PWR ACTUATOR EH VLV LEAKING. REPLACED PLATE SEALS AND O-RING. SERVICED HYD SYS AND LEAK CHECKED OK.