As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH- DURING FLIGHT 3588 THE CREW NOTED THAT THE NUMBER 2 PACK ON IN FLIGHT PRODUCES BURNING SMELL AND SMOKE IN MAIN CABIN. IAH- MAINTENANCE REMOVED AND REPLACED THE NUMBER 2 AIR CYCLE MACHINE, PERFORMED A OPERATIONAL CHECK OF THE AIRCONDITIONING SYSTEM, NO DEFECTS NOTED, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.