As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SIGNIFICANT EVENT - EN ROUTE FROM CYS - DEN THE PILOTS REPORTED A LOUD VIBRATION COMING FROM THE NOSE WHEEL AREA, IT STOPPED WHEN THE GEAR WAS EXTENDED. PILOTS DECLARED AN EMERGENCY AND TRUCKS WERE DEPLOYED. MAINTENANCE DETERMINED THAT THE LEFT HAND FORWARD NOSE LANDING GEAR DOOR WAS FOUND UNLATCHED. MAINTENANCE FOUND NO DEFECTS AND RE-ATTACHED THE DOOR LATCHES. OPERATIONAL CHECKS GOOD IAW MM 32-22. LANDING WAS UNEVENTFUL.