As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
*SDR FILED OPEN* *DIVERSION* AT FL 360 WE HAD A LEFT HYD DEM PUMP. WE NOTICED THE LEFT HYD QTY DROPPING RAPIDLY. EVENTUALLY THE LEFT HYD QTY EICAS CAME ON. WE TURNED OFF LEFT DEMAND PUMP WHICH SLOWED THE LOSS OF HYD FLUID T/S FOUND PRESSURE SWITCH TUBE ASSY BROKEN AT PRESSURE AND CASE DRAIN FILTER MODULE ASSY.