As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NOSE GEAR DID NOT SHOW DOWN AND LOCKED. CYCLED IAW CHECKLIST, SUCCESSFUL 3 DOWN. GEAR HORN SOUNDED CONTINUOUSLY WHEN FLAPS EXTENDED TO 30 DEGREES CONFIRMING GEAR UNSAFE CONDITION. REPLACED NOSE LANDING GEAR LOCK SWITCH IAW MM 32-61-21 AND OPS CHECK GOOD.