As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 5454 - STL - JUST AFTER TAKEOFF, CREW EXPERIENCED VERY STRONG VIBRATION COMING FROM THE COCKPIT. MAINTENANCE INSPECTED THE AIRCRAFT AND PERFORMED SEVERAL GEAR OPERATIONAL CHECKS. FOUND THE NOSE WHEEL ASSEMBLIES TO BE OUT OF BALANCE. REMOVED AND REPLACED THE NOSE WHEEL ASSEMBLIES.