As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HIGH FREQUENCY VIBRATION AND A LOWER FREQUENCY RUMBLING NOISE INFLIGHT. CHECKED PROP SYNC, FLAPS AND GEAR INFLIGHT. ALL INDICATIONS NORMAL. PHENOMENON WENT AWAY WITH GEAR DOWN. INSPECTED AIRCRAFT FOR ABNORMALITIES IN AIRSTREAM GEAR AND GEAR DOOR OPERATIONS. FOUND NORMAL. NO DISCREPANCIES FOUND.