As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2341: ON FINAL APPROACH, RECEIVED SMOKE WARNING LIGHT. OFF AND ON ABOUT 6 TIMES IN THE AIR AND ONCE ON THE GROUND. THE SMOKE LIGHT FLICKERED EACH TIME. MAINTENANCE PERFORMED GVI OF THE FWD AND AFT SMOKE DETECTORS. CLEANED SMOKE DETECTORS WITH COMPRESSED AIR. C/W FUNCTIONAL TEST OF BAGGAGE SMOKE DETECTORS IAW Q400 AMM 26-12-06 PAGE 501 AND LAV SMOKE DETECTOR IAW 26-12-11 PG 501. NO OTHER DEFECTS NOTED. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.