As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT NOTED UNUSUAL NOISE AFTER GEAR RETRACTION FOLLOWED BY A NOSE GEAR DOOR VISUAL AND AURAL WARNING. CYCLED GEAR DOWN AND HAD 3 GREEN DOWN AND LOCKED INDICATION. NOSE GEAR DOOR REMAINED OPEN. PILOT ELECTED TO LAND FOR MAINTENANCE. MAINTENANCE WAS ABLE TO DUPLICATE PROBLEM WITH AIRCRAFT ON JACKS.