As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LANDING DURING TAXI IN, SMOKE WAS BRIEFLY SEEN COMING FROM OVERHEAD PSU AREA THROUGHOUT THE CABIN. MAINTENANCE PERSONNEL REPLACED BOTH COALESCER BAGS IAW AMM 21-20-02, SYSTEM OPERATIONAL CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE.