What was found
LAX INFLIGHT T88/02MAR - AFTER TAKEOFF, LEFT HYDRAULIC QUANTITY DECREASED TO .15. RETURNED TO LAX AND LANDED WITHOUT INCIDENT. FOUND NUMBER SIX SPOILER ACTUATOR FILTER PLUG CRACKED AND LEAKING. REPLACED NUMBER SIX SPOILER ACTUATOR FILTER PLUG AND O-RING. REPLACED ALL FOUR LEFT BRAKES DUE TO HYDRAULIC CONTAMINATION. SERVICED LEFT HYDRAULIC SYSTEM. SYSTEM GROUND CHECKED NORMAL OPERATION.