As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - DURING FLIGHT THE CREW REPORTED THAT THEY SMELLED BURNING / SMOKE. RAN QRH TURNED OFF THE RECIRC FAN AND THE SMELL DISSIPATED. THE AIRCRTAFT LANDED AT IAH WITHOUT INCIDENT WHERE MAINTENANCE REMOVED AND REPLACED THE NUMBER 1 ACM, OPERATIONALLY TESTED WITH NO DEFECTS OR SMOKE SMELL NOTED AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.