As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 1634 - THE FLIGHT ATTENDANT REPORTED A SMOKE SMELL IN THE CABIN DURING APPROACH AND PACK 2 FAIL DURING TAXI IN. MAINTENANCE REPLACED THE NR 2 AIR CYCLE MACHINE. ALSO REPLACED THE NR 2 DUAL HEAT EXCHANGER AND NR 2 DUAL HEAT EXCHANGER INLET DUCT DUE TO CONTAMINATION. OPERATIONAL CHECK IS GOOD, NO LEAKS NOTED AND NO ODORS DURING OPERATIONAL CHECK.