As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLIGHT 2736, DURING PREFLIGHT INSPECTION THE CREW REPORTED A STRONG ELECTRICAL SMELL FROM THE LAVATORY. MAINTENANCE INSPECTED THE AIRCRAFT AND REMOVED AND REPLACED THE LAVATORY LIGHT BALLAST. OPERATIONALLY TESTED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.