As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 389 - EN ROUTE SAT-DFW - DURING DESCENT, LEFT HYDRAULIC QUANTITY EICAS MESSAGE CAME ON. LEFT RESERVOIR LIGHT ALSO CAME WITH ZERO PRESSURE SHOWING. AIRCRAFT LANDED AT DFW WITHOUT INCIDENT. INSPECTION OF AIRCRAFT FOUND NO LEAKS. REPLACED LEFT RESERVOIR PRESSURIZATION MODULE FILTER. REPLACED LEFT HYDRAULIC RESERVOIR PRESSURE RELIEF VALVE. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)