As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CLIMB LT HYD PRESS LOW MESSAGE ON OAP. PRESSURE EVENTUALLY DROPPED TO 0 PSI. RAN HYD PRESSURE LOW CHECKLIST AND LT HYD FAILURE CHECKLIST. INDICATIONS STABILIZED AT 0 PSI AND 27QTS. FOUND LEFT HYD RESERVOIR FAILED CAUSING AIR IN LEFT SYS AND NR 1 ENG DRIVEN PUMP FAILURE. EVIDENCE OF BURNT HYDRAULIC FLUID AND TAR BUILD UP AT EDP AND EDP HYD LINES. REPLACED LEFT PTU, THE LEFT HYDRAULIC RESERVOIR, AND LEFT EDP. ALSO, FLUSHED LINES PER MM AND REPLACED ALL FOUR HYD FILTERS ON LEFT SIDE.