As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ABOUT 15 MINUTES PRIOR TO TOUCHDOWN AT STL THE FLIGHT CREW NOTICED THAT THE LEFT HYDRAULIC SYSTEM FLUID QUANTITY DECREASED TO ZERO. COM PROCEDURES WERE COMPLIED WITH AND THE AIRCRAFT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND THE ALTERNATE HYDRAULIC PUMP HOUSING LEAKING AND REPLACED THE ALT PUMP, THE ENGINE DRIVEN PUMP, AND ASSOCIATED FILTERS. SYSTEM WAS RE-SERVICED, LEAK CHECKED, AND THE AIRCRAFT HAS RETURNED TO SERVICE.