As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2106, DURING DESCENT WITH POWER LEVERS NEAR FLIGHT IDLE, FLIGHT ATTENDANT REPORTED SMOKE IN THE CABIN. SHORTLY AFTER SMOKE CAME INTO COCKPIT AND LAV SMOKE DETECTOR ALARM CAME ON. PER CHECKLIST TURNED OFF BLEED 1. SHORTLY THERE AFTER SMOKE CEASED, REPLACED P2.5/P3 VALVE. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.