As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED LOSING HYD SYSTEMS. DECLARED EMERGENCY. A/C LANDED W/O INCIDENT. HYD QTY DROPPED TO STANDPIPE LEVEL FOLLOWED BY RUDDER & AILERON CONTROL MANUAL LIGHTS COMING ON, (FL 390 & 150 NM FROM DESTINATION). REMOVED AND REPLACED RESERVOIR AIR PRESS REGULATOR ASPIRATOR & TEE-FITTING IAW MM 29 10 03 2, OPS CHECKED NORMAL.