What was found
MIZ/JFK - FLT 24 - DURING TAXI TO GATE, SMOKE IN MID-CABIN. SUSPECT NR 2 PACK AS IT SHUT DOWN AUTOMATICALLY. TROUBLESHOT SYSTEM, FOUND NR 2 PACK TO BE OK, FOUND NR 1 PACK ACM AT FAULT. REMOVED AND REPLACED NR 1 ACM, GROUND CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE.