As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - FLIGHT 2034 - THE CREW REPORTS THE LAVATORY SMOKE DETECTOR IS SOUNDING INTERMITTENTLY. MAINTENANCE INSPECTED THE AIRCRAFT AND REPLACED THE LAVATORY SMOKE DETECTOR. THE ENGINES WERE RUN AND NO SMELLS OR SMOKE WERE NOTED. OPERATIONAL CHECKS WERE GOOD AND THE AIRCRAFT WAS RETURNED TO SERVICE.