As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L HYD SYS PRESSURE LOSS OF LEFT HYD. QUANTITY "0". QRH REFERENCED. PTU FUNCTIONED PROPERLY. DECLARED EMERGENCY. REQUESTED TOW FROM MAINTENANCE. IND REMOVED AND REPLACED LEFT ENGINE DRIVEN HYDRUALIC PUMP CASE DRAIN MODULE IAW AMM 29-11-17-4. OPS CHECK LEAK CHEK GOOD. OFF UNIT.