As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECEIVED REPORT OF HYD LEAK OBSERVED ON GROUND DURING TAXI/TAKEOFF. OBSERVED DROP IN HYD 1 QTY FROM 1.01 TO 0.88. ASSUMED ACTIVE LEAK AND RTB. FOUND HYD LEAK AT LINE FITTINGS CONNECTED TO THE LH WING #1 HYD SUPPLY SHUT-OFF VALVE. HYD LINES TIGHTENED PROPERLY IAW AMM 27-13-01-404-009. PERFORMED HYD LEAK CHECK. NO LEAK FOUND, NO FURTHER DEFECTS NOTED.