What was found
AIRFRAME VIBES. GOES AWAY WITH ROLL INPUTS. VIBRATION REPORT CHECKLIST COMPLETE. FLIGHT CRE W REPORT STATES, SLOWING TO 300 KIAS AT FL280 IN CLIMB, ALL VIBES WENT AWAY. DEFINITELY SPEED RELATED, MEDIUM FREQUENCY FELT LIKE ELEVATOR OR AILERON FLUTTER, BUT INTENSITY WAS SAME FROM TAIL TO COCKPIT, WITH OR WITHOUT AUTOPILOT. REPLACED LT BLUE AND RT GREEN AILERON SERVO.