What was found
CAPTAIN REPORTED THAT DURING FLIGHT LOT HYDRAULIC LIQUID IN THE LEFT SYSTEM WITH HYDRAULIC PRESSURE CORRECT. DURING REVISION WAS DETECTED THE HYDRAULIC TANK LEFT SYSTEM EMPTY, IT WAS RECHARGED. THE LEFT SYSTEM WAS PRESSURIZED AND BRAKE RETURN LINE HAD A LEAK. THE BRAKE RETURN LINE LEFT SYSTEM WAS REPLACED IAW MM 32-42-00, TESTED CORRECT. DURING OVERNIGHT SERVICE, THE RETURN LINE BRAKE LEFT SYSTEM WAS VERIFIED FOR LEAKS IAW MM 32-42-00, TESTED CORRECT.