As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH, CREW GOT GEAR UNSAFE WARNING WITH THE 2 MAINS SHOWING GREEN, BUT NO GREEN FOR THE NOSE GEAR. CREW RAN CHECKLIST AND AFTER STILL NO GREEN INDICATED ON NOSE GEAR. EMERGENCY DECLARED. ON SITE MX FOUND THE NOSE GEAR DOWNLOCK CONNECTOR NOT FULLY ENGAGED. INSTALLED THE NOSE GEAR DOWN LOCK CONNECTOR TO THE FULLY ENGAGED POSITION OPS CHECK GOOD IAW MM. ACFT RETURNED TO SERVICE.