As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - DURING CLIMB THE CREW REPORTED AN ELECTRICAL BURNING SMELL IN THE AIR BETWEEN THE CABIN AND FLIGHT DECK. THE AIRCRAFT RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE LIGHT BALLAST AT ROW 12, OPERATIONALLY TESTED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.