As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE:N/A AIR TURN BACK - LT HYDRAULIC SYSTEM LOSS OF QUANTITY AND PRESSURE. PASSING 8000 FT. LEFT HYD. QTY EICAS FOLLOWED BY L HYD ENG PUMP EICAS AND L HYD SYS PRESS. HYD QTY 0.0 ON STATUS PAGE. ATB ACCOMPLISHED WITH ALTERNATE FLAP EXT AND ALTERNATE EXTENSION PROCEDURES. REPLACED LT GEAR DOWNLOCK ACT. PRESSURE LINE PER AMM 20-10-10-404-001. ACCOMPLISHED LEAK CHECK PER AMM 32-32-02-404-010 OPS AND LEAK CHECK OK. RETURN FLT CONTROLS TO NORMAL POSITION. AIRCRAFT OK FOR SERVICE.