What was found
AIR TURNBACK, AIRFRAME VIBRATION, LOG 7555408, ON CLIMB-OUT OF MCI, AFTER FLAPS RETRACTED AND ACCELERATION THROUGH FL230, STARTED FEELING VIBRATION THROUGHOUT A/C. DID NOT GO AWAY AFTER PWR REDUCTION ON EACH ENGINE. TROUBLESHOT AND REPLACED NR 6 SPOILER ACTUATOR PER R3M27021. OPS CK GOOD