As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX- LAVATORY SMOKE ALARM SOUNDED DURING CLIMBOUT. FLIGHT ATTENDANT INVESTIGATED AND FOUND NO SMOKE IN LAVATORY OR CABIN. ALARM RESET BY FLIGHT ATTENDANT FOR REMAINDER OF FLIGHT. REMOVED AND REPLACED SMOKE DETECTOR. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.