As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RDM - FLIGHT 2162 - THE CREW REPORTS THE LAVATORY SMOKE DETECTOR SOUNDED DURING THE APPROACH FOR LANDING. MAINTENACE INSPECTED THE AIRCRFAFT AND REPLACED THE NR 1 AND NR 2 P2.5/3.0 SWITCHING VALVES. THE ENGINES WERE RUN AND THE OPERATIONAL CHECKS WERE GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.