As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE RETRACTING THE GEAR, THE NOSE WHEEL VIBRATED EXCESSIVELY ALONG WITH MAKING A LOUD THUMPING NOISE. THIS WAS ACCOMPANIED WITH A RAPID FLICKERING OF THE NOSE GEAR UNSAFE RED LIGHT IN THE COCKPIT. REPLACED LT & RT MAIN GEAR DOOR PROX DETECTORS. R & R CAP LOCK NOSE ASSEMBLY & PERFORMED SEVERAL GEAR SWING NOTING NO VIBRATION ON RETRACTION IAW AMM 32-61-49-900-801.