As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH FLIGHT 2934 - DURING PREFLIGHT INSPECTION THE CREW REPORTED A BURNING SMELL IN THE LAV. MAINTENANCE REMOVED AND REPLACED THE LAVATORY LIGHT BALLAST, OPERATIONALLY TESTED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.