What was found
LEFT HYD SYS FAILURE AS CONFIGURATION FOR LANDING, HAD TO SERVICE LT HYD SYS ON PREFLIGHT DUE TO LOW FLUID, FOUND LE SLAT BYPASS VLV LEAKING. REMOVED, REPLACED & TESTED IAW MM 27-81-09-4. R & R LT SYS EDP PRESS & CASE DRAIN FILTERS IAW MM 29-11-17-4 FILTERS CLEAN. LEAK CHECKED GOOD, DPI NOT POPPED. SERVICED LT HYD SYS IAW MM 12-12-01-3. RAN ENG IAW JRH & OPERATED FLIGHT CONTROLS & LT SYS COMPONENTS. LEAK CHECKED GOOD. OPERATIONS CHECKED GOOD. FOUND HOUSING CRACKED AT PORT B LE SLAT BYPASS VLV.