As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW EXPERIENCED A LOW HYD SYS PRESSURE AND DECLARED AN EMERGENCY PRIOR TO LANDING. EICAS C HYD QTY MESSAGE 4 HRS AFTER T/O. C HYD QTY SHOWED 0.46 TURNED OFF C HYD PRESS TO SAVE FLUID. QTY SLOWLY DROPPED TO 0.35. FRM 29-11-15-00 HYD LEAK FOUND AT C2 PUMP PRESSURE LINE. SEAL REPLACED AT PUMP UNION IAW AMM 29-11-02 PB401. LEAK CHECKED OK. C HYD TANK SERVICED.