What was found
LT LOW SPEED AILERON FAILED TO DISCONNECT UPON SLAT RETRACTION. FUEL DUMP PROCEDURES FOLLOWED, AIRCRAFT RETURNED TO AIR FIELD, LANDING NORMAL. MANUALLY DISCONNECT LOW SPEED AILERON. LOCK OUT ACTUATOR I/A/W 27-00-00, VERIFIED ROD IS RETRACTED AND IN DISCONNECT MODE MEL 27-11-01 CAT "C" EXP 3-15-05 PLACARD INSTALLED. AIRCRAFT RETURNED TO SERVICE. FOUND LT LOW SPEED AILERON ACTUATOR AT FAULT. REMOVED AND REPLACED LT LOW SPEED AILERON ACTUATOR. SYSTEMS OP'S CHECK GOOD I/A/W 27-11-43, PLACARED REMOVED MEL CLEARED. AIRCRAFT OK FOR SERVICE.