As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF ACFT EXPERIENCED A VIBRATION IN AREA OF NLG. ACFT RETURN TO FIELD. FOUND NLG LT AFT DOOR ATTACH STRUT BROKEN. REPLACED & ADJUSTED THE LT AFT NLG DOOR OPERATOR STRUT ASSEMBLY IAW AMM 32-22-04. JACKED NOSE IAW AMM 07-11-02 & SWUNG GEAR TO VERIFY ADJUSTMENT & FAIR OF DOOR.