As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT THE LEFT HYDRAULIC PRESSURE LOW LIGHT ILLUMINATED. TRANSFER PUMP WAS TURNED OFF. QUANTITY IN LEFT SYSTEM 3 QUARTS, PUMP PRESSURE WENT TO 3000 PSI FOR 5 SECONDS THEN DROPPED TO 1000 PSI. PUMP TURNED OFF. EMERGENCY DECLARED. LANDING UNEVENTFUL. AIRCRAFT GROUNDED. MAINTENANCE FOUND A LOOSE B-NUT ON THE LEFT THRUST REVERSER FILTERS MOUNT BLOCK. RETORQUED B-NUT IAW AMM 20-30-02. OPS AND LEAK CHECKED NORMAL.