As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: LEFT ENGINE VIBRATIONS AT FL 320 4.1-4.2. FLIGHT CREW WENT BACK AND FELT A STRONG VIBRATION THROUGH THE FLOOR AND AIRFRAME ABNORMAL RUMBLE. DECESION MADE TO DIVERT TO CLT. AIRCRAFT LANDED OVERWEIGHT WITHOUT INCIDENT. MAINTENANCE REPLACED #1 ENGINE IAW JC 72L40072006.