What was found
IAH - FLIGHT 2041, THE CREW REPORTED A FUEL SMELL IN THE CABIN ON START. MAINTENANCE PLACED THE APU ON MEL 49-00-00, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. THE AIRCRAFT RETURNED TO IAH ON FLIGHT 2891 WHERE MAINTENANCE REMOVED AND REPLACED THE APU FUEL NOZZLES, OPERATIONALLY CHECKED WITH NO DEFECTS. THE MEL WAS REMOVED, AND THE AIRCRAFT APPROVED FOR RETURN TO SERVICE.