As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FINAL APPROACH, RECEIVED MASTER WARNING LIGHT WITH SMOKE LIGHT. LIGHT STAYED ON FOR APPROX 20 SECONDS, THEN WENT OUT THEN FLICKERED ON THEN OFF. (MX) VISUAL INSP OF THE SMOKE DETECTORS. OPS CHECK GOOD IAW 26-12-00 PG. 201. NO DEFECTS NOTED.