As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOTS REPORTED THAT THEY RECEIVED A GPWS WARNING FOR AN UNSAFE GEAR CONDITION DURING A RETURN TO FIELD FOR A CABIN DOOR ANNUNCIATOR. THE CREW MANUALLY EXTENDED THE GEAR AND DECLARED AN EMERGENCY WITH THE TOWER. MAINTENANCE REMOVED AND REPLACED THE NLG DOWNLOCK SWITCH IAW AIM 14.3.2, OPS CHECKED GOOD. PERFORMED NLG RIGGING.