What was found
IAH - FLIGHT 2496, THE CREW REPORTED AN ACRID BURNING SMELL LIKE TIRES OR GUNPOWDER DESCENDING THROUGH FL270 THAT ONLY LASTED A FEW SECONDS, WITH NOTHING NOTICED BY THE F/A. THE AIRCRAFT LANDED AT IAH WITHOUT INCIDENT WHERE MAINTENANCE REMOVED AND REPLACED THE NUMBER ONE ENGINE, OPERATIONALLY TESTED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.