As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF CLIMB, GREEN NOSE GEAR LIGHT DOWN STAYED ON CALLED MX. PERFORMED ALTERNATE EXTENSION. RETURN TO FIELD. LANDING UNEVENTFUL. TOWED BACK TO GATE. REPLACED THE LANDING GEAR SELECTOR HANDLE WITH NO HELP. R & R THE ADVISORY CONTROL BOX IAW AMM TASKS 31-51-06-000-801 AND 31-51-06-400-801. OPS CHECK GOOD. PERFORMED AN OPS TEST OF THE EXTENSION AND RETRACTION SYSTEM IAW AMM TASK 32-31-00-710-801, TR 32-355. OPS CHECK GOOD. RETURNED TO SERVICE.