As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW TO JFK FLIGHT 6496 AT CRUISE THE A FLIGHT ATTENDANT INFORMED THE FLIGHT DECK THAT THERE WAS A STRONG BURNING SMELL IN THE FORWARD PART OF THE CABIN. AT THE SAME MOMENT THE CREW NOTICE A BURNING SMELL AS WELL. CREW DECLARED AN EMERGENCY AND DIVERTED TO IND. THE SMELL SLOWLY STARTED TO DISSIPATE AFTER LANDING. MAINTENANCE REPLACED THE NR 2 DUEL HEAT EXCHANGER AND CLEANED COFFEE RESIDUE FROM ACM.