As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS AIRFRAME VIBRATION ABOVE APPROX FL 180 AND ABOVE 300 KTS. VIBRATION WAS APPROX 7-10 CYCLES/SECOND. MAINTENANCE REMOVED AND REPLACED THE #1 ELEVATOR AND AILERON COMPUTER IAW AMM 27-93-34 & REMOVED AND REPLACED THE RH ELEVATOR SERVO CONTROL IAW AMM 27-34-51. LEAK CHECK GOOD. (SEE SDR # AALA201905269010)