What was found
CREW RECEIVED SMOKE TOILET MESSAGE WITH VISIBLE SMOKE IN CABIN AT FL210 IN DESCENT. CREW LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED AND REMOVED AND REPLACED THE FOLLOWING: PSU PCB (PASSENGER SERVICE UNIT PRINTED CIRCUIT BOARD) ON ROW 11 D/F (BURNT), SIDEWALL BALLAST ABOVE ROW 12 (BURN MARK), ROW 10 SIDEWALL LAMP (DAMAGED) AND LAV SMOKE DETECTOR (PRECAUTIONARY PURPOSES). CHECKS WERE PERFORMED AND AIRCRAFT RELEASED FOR SERVICE. ALL WORK ACCOMPLISHED BY MAINTENANCE USING AIRCRAFT AND COMPONENT MAINTENANCE MANUALS.