As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 131 BUF-JFK, BURNT SMELL FROM AFT CABIN ON APPROACH, TURNED OFF NR 2 PACK AND TV AS PRECAUTION. PERFORMED FIM TASK 21-70-00-810-801A FOUND NR 2 PACK ACM TO BE AT FAULT. REMOVED AND REPLACED RT AIR CYCLE MACHINE IAW 21-51-05. OPS CHECK NORMAL.