As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INFLIGHT L HYD QUANTITY BLED TO ZERO WITH ASSOCIATED L HYD QTY EICAS MESSAGE. FOUND RIDGED PIPE FROM LT HYD SYS RESERVOIR SUPPLY, HOLEDSIGN(?) OF CHAFING ON HOLD OPEN STAY. REPAIRED PIPE IAW AMM 20-10-09-358-151. RAN LT HYD PUMP. NO LEAKS. LT SYSTEM FILLED.