As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT HYDRAULIC QTY DECREASED TO 3 QTS, PER PROCEDURE AFTER PUMP TURNED BACK ON LEFT PRESSURE REMAINED ZERO PUMP TURNED OFF. FOUND L1 LINE AT FILTER MODULE FWD FILTER WORN THROUGH BY A BOLT. REPLACED LINE PER AMM SPUN ENGINE LEAK CKS GOOD. SERVICED LEFT HYDRAULIC QTY TO FULL PER AMM OK FOR SERVICE.