As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NOSE GEAR DOWN GREEN LIGHT REMAINED ILLUMINATED AFTER GEAR RETRACTION. ALL CREW INDICATIONS INCLUDING GEAR NOISE INDICATED THE GEAR WAS UP. ACCOMPLISHED ALTERNATE GEAR EXTENSION IAW CHECKLIST. GEAR EXTENDED WITH NO PROBLEMS. NOSE GEAR GREEN LIGHT INDICATOR BECAME BRIGHTER AFTER GEAR EXTENSION. RETURNED TO FIELD. LANDING UNEVENTFUL. REMOVED & REPLACED LANDING GEAR CONTROL UNIT IAW AMM TASK 32-31-01-000-801 AND AMM TASK 32-31-01-400-801. FUNCTIONAL TESTED GOOD. NO DEFECTS NOTED. OPERATIONAL CHECK FLIGHT GOOD. RETURNED TO SERVICE.