As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING POST FLIGHT 3474, SMOKE IN CABIN WHEN NR 2 PACK IS SELECTED ON. SMOKE ENTERED CABIN THROUGH AIR VENTS WITH PACK NR 2 SELECTED ON. MAINTENANCE DEFERRED PACK NR 2, IAW MEL 21-50-1 (B) PACK NR 1 OPERATES NORMALLY WITH APU. MAINTENANCE REMOVED AND REPLACED NR 2 PACK PER JC 0312 OPS/LEAK CHECKS GOOD.