As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 2052 SMOKE WARNING LIGHT CAME ON IN FLIGHT THREE TIMES FOR 45 SENCONDS, THEN WENT OUT. NO OTHER INDICATIONS OF SMOKE IN COCKPIT OR CABIN. REMOVED AND REPLACED NR 2 SMOKE DETECTOR. OPERATIONAL CHECKS GOOD. AIRCARFT RETURNED TO SERVICE.