As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT HYDRAULIC QUANTITY DECREASED INFLIGHT FROM 11 QUARTS TO 4 QUARTS. FOLLOWED POM PROCEDURE AND QUANTITY INCREASED TO 19 QUARTS. TURNED LEFT ENGINE AND AUXILLARY AND TRANSFER PUMPS BACK ON AND QUANTITY WENT SLOWLY BACK TO ZERO AND PRESSURE ZERO. REPLACED LINE FROM THRUST REVERSER BYPASS VALVE TO CASE DRAIN FILTERS. REPLACED CASE DRAIN FILTERS AND TRANSFER PUMPFILTER. LEAK CHECKS GOOD.