As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NOSE GEAR DID NOT EXTEND WHEN GEAR HANDLE WAS LOWERED WITH AN AMBER NOSE DISAGREE THAT TURNED TO RED. WENT TO ALTERNATE PROCEDURE AND GREEN LIGHT ILLUMINATED. EMERGENCY WAS DECLARED. LANDING AND TAXI WERE UNEVENTFUL. FSR AND ENGINEERING ARE INVOLVED IN THE INVESTIGATION.