As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 107 - KAUS-KPIA - ON GEAR RETRACTION SEVERE SHIMMY AND LOUD NOISE WAS EXPERIENCED. AS AIRSPEED INCREASED PROBLEM INCREASED IN NOSE WHEEL WELL AREA. RETURNED TO KAUS. FOUND LEFT FORWARD NLG DOOR IN DOWN POSITION, WOULD NOT LOCK UP. REMOVED AND REPLACED NLG DOOR LOCK LINK. OPS CHECKS GOOD.