As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MLG VIBRATION AFTER RETRACTION, AIRCRAFT SHUDDERED VIOLENTLY CLIMBING THROUGH 7000'. VIBRATION FELT LIKE IT CAME FROM BELOW PILOT'S FEET. NO ABNORMAL GEAR INDICATIONS WERE NOTED. GEAR WAS NOT BLOWN DOWN. REMOVED AND REPLACED BOTH NLG WHEEL ASSYS (OFF) - LT 6942060-2 S/N: T0196 RT 6942060-2 S/N: T0190