As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLIGHT 2547, DURING PREFLIGHT INSPECTION THE CREW REPORTED A BURNING SMELL IN THE CABIN. MAINTENANCE INSPECTED THE AIRCRAFT AND REMOVED AND REPLACED THE GALLEY LIGHT BALLAST, OPERATIONALLY TESTED WITH NO DEFECTS. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.