As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMBOUT FROM ANC AVIONICS SMOKE WARNING SYSTEM ACTIVATED. CREW PERFORMED CHECKLIST PROCEDURE AND DETERMINED TO BE FALSE WARNING. WARNING STAYED CONTINUOUS AND CREW ELECTED TO RETURN TO ANC. MX CHANGED AVIONICS SMOKE DETECTOR AND RETURNED AIRCRAFT TO SERVICE.