As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - SMOKE WARNING LIGHT FLASHED ON IN FLIGHT. UPON ARRIVAL IN SEA, MAINTENANCE INSPECTED BAGGAGE COMPARTMENT, NO SMOKE, FIRE, OR SMELL NOTED. REPLACED NR 1 AND NR 2 SMOKE DETECTORS. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE. NR 2 S/N 0542 542 HOURS, 772 CYCLES.