What was found
NR 1 HYDRAULIC ISOLATION VALVE CAUTION LIGHT ILLUMINATED WHEN TAKING RUNWAY FOR TAKEOFF. NR 1 HYDRAULIC QUANTITY WENT TO 1.0 NORMAL BRAKING FAILED. CREW SHUT DOWN NR 1 ENGINE AND RETURNED TO GATE. REMOVED AND REPLACED THE LEFT WING INBOARD ROLL SPOILER PER LOG BOOK WRITE-UP. RECONNECTED HYDRAULIC LINES AND ACTIVATED SYSTEM, FOUND RIGHT WING INBOARD ROLL SPOILER AEROSPACE ACTUATOR LEAKING. REMOVED AND REPLACED ACTUATOR. PLEASE NOTE: ACTUATOR MANUFACTURER IS SMITH AEROSPACE, DID NOT FIND OPTION IN DROP DOWN FOR SMITH AEROSPACE.