As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: EXTREME NOSE GEAR VIBRATION DURING ROTATION, RETRACTION, AND AFT GEAR WAS UP/LOCKED. ALL 3 FA REPORT VIBRATION WAS FELT THROUGHOUT ENTIRE PASSENGER CABIN. DURING THE TROUBLE SHOOTING THIS VIBRATION EVENT MAINTENANCE FOUND THE NOSE LANDING GEAR TORQUE LINKS CENTER APEX PIN HAD PLAY DUE TO BEING INSTALLED INCORRECTLY AND REPLACED IT PER AMM 32-21-27.