As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LIGHT AIRFRAME VIBRATION DURING CLIMB, FL190 TO FL230. FELT IN COCKPIT ONLY. STOPPED IN TURN, STARTED AGAIN AT WINGS LEVEL. SIMILAR ON DESCENT. DIVERTED, PERFORMED AN OPS TEST OF AILERON DAMPING IAW 27-10-00-810-828-A. DURING TEST FOUND LEFT AILERON SERVO GREEN HYD SYS AT FAULT. SERVO SHUDDERS AT END OF TRAVEL AND MID TRAVEL CAUSING MED TO HIGH FREQ VIBRATIONS.