What was found
DURING CLIMB/CRUISE LEVEL 2 ALERT "AIL DEFLECTOR DISAGREE" ILLUMINATED. QRH (QUICK REF HANDBOOK) PROCEDURES FOLLOWED, LIGHT REMAINED ON. AIRCRAFT DUMPED APPROX. 48,400 LBS IF FUEL FOR APPROVED LANDING WEIGHT. A/C RETURNED TO FIELD. LANDING NORMAL. MX FOUND BAD AILERON ACTUATOR, LEFT O/B ACTUATOR REPLACED. OP'S CHECKED SATISFACTORY, A/C RETURNED TO SERVICE.