As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLIGHT 2873, DURING PREFLIGHT INSPECTION THE CREW REPORTED A PLASTIC BURNING SMELL. MAINTENANCE INSPECTED THE AIRCRAFT AND REMOVED AND REPLACED THE OVERHEAD LIGHT CONTROLLER, OPERATIONALLY TESTED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.