As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER GEAR RETRACTION PILOT NOTED A VIBRATION IN THE NOSE GEAR AREA. CREW ACCOMPLISHED FLY BY FOR VISUAL CHECK OF NOSE AREA, THEN RETURNED TO STL. FOUND LEFT NOSE GEAR DOOR NOT MANUALLY LATCHED. SECURED DOOR AND CHECKED MANUAL LOCK OPERATION.