As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT HYD QTY DECREASED TO 3 QTS CLIMBING THRU 17K. TURNED OFF LEFT ENG HYD PUMP AND QTY INCREASED TO 15 QTS. ON FINAL W/ LEFT ENG PUMP AND XFER PUMP ON LEFT HYD QTY AND PRESS WENT TO 0. MTC NOTED EMPTY RESERVOIR. FOUND T/R CNTRL VLV LINE LEAKING. SECURED SAME. LEAK CHECK OK.