As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE THE MAIN CABIN SMOKE DETECTOR LIGHT ILLUMINATED. COMPLIED WITH EMERGENCY CHECK LIST. LANDED WITHOUT INCIDENT. LIGHT EXTINGUISHED ON TAXI IN. INSPECTED AND TESTED SMOKE DETECTOR SYSTEM. REPLACED THE NR 2 DETECTOR DUE TO INTERMITTENT TEST. SYSTEM OPS CHECK NORMAL. (M)