What was found
PDIS 780 29-02 5877 23NOV21 IND OPEN U L HYD QTY SHGN 23NOV21 08:05 IND U ACFT BLOCKED IN W LEFT HYD SYSTEM QTY READING .55. RAN LEFT SYSTEM ELECTRIC PUMPS AND OPENED MAIN CARGO DOOR AS REQ. W/ NO PUMP CAVITATION. SHGN 23NOV21 08:30 IND U FOUND DPI INDICATOR LEAKING IN LEFT ENGINE DRIVEN PUMP CASE DRAIN PRESSURE FILTER MODULE ASSEMBLY. ORDERED PRESSURE FILTER, RETURN FILTER, DPI INDICATOR, AND ALL ASSOCIATED O-RINGS AND PACKINGS. AIRCRAFT HYD QTY LOSS FROM THE L HYD SYSTEM IN FLT. SHGN 23NOV21 08:30 IND FOUND DPI INDICATOR LEAKING IN LEFT ENGINE DRIVEN PUMP CASE DRAIN PRESSURE FILTER MODULE ASSEMBLY. ORDERED PRESSURE FILTER, RETURN FILTER, DPI INDICATOR, AND ALL ASSOCIATED O-RINGS AND PACKINGS. SHGN 23NOV21 12:35 IND REMOVED DPI FROM LEFT PYLON HYDRAULIC MANIFOLD REF B757 AMM 29-11-17-4. FACT 23NOV21 19:32 IND INSTALLED DPI AS REQUIRED. SERVICED SYSTEM AND LEAK CHECK GOOD. AIRCRAFT OK FOR SERVICE. REF. MM. 29-11-17-4.