As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - DURING PREFLIGHT INSPECTION THE CREW REPORTED A HOT ELECTRICAL SMELL IN THE AREA OF SEAT 1A. MAINTENANCE REMOVED AND REPLACED THE BALLAST 2A, OPERATIONALLY TESTED WITH NO DEFECTS NOTED, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.