As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW RECEIVED A SMOKE, MASTER WARNING, AND ANNUNCIATOR INDICATIONS ON TWO OCCASIONS. NO SMOKE OR ABNORMAL SMELLS WERE NOTICED. MAINTENANCE INSPECTED THE SYSTEM AND FOUND THE NR 2 SMOKE DETECTOR CONNECTOR PLUG NOT TIGHT. BOTH THE NR 1 AND 2 DETECTOR CONNECTOR PLUGS WERE REMOVED, CLEANED AND REINSTALLED. OPERATIONAL CHECKS WERE GOOD AND THE AIRCRAFT WAS RETURNED TO SERVICE.