As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT APPROX 310 KNOTS, CLEAN AIRCRAFT AT 10,600 FT AIRCRAFT BEGAN TO SEVERELY VIBRATE ALMOST IMMEDIATELY. AS WE SLOWED THE AIRCRAFT DOWN, VIBRATION SEEMED TO SUBSIDE AND EVENTUALLY WAS JUST A MILD VIBRATION ON APPROACH. SUSPECT A DOOR DEPARTED OR CAME OPEN. EMERGENCY DECLARED. R & R THE LT FWD NOSE LANDING GEAR DOOR LINK ASSY UP TO AND INCLUDING AMM 32-36-03-4 STEP 3.E.1.F.