As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLIGHT 3104, THE CREW REPORTED AN ELECTRICAL BURNING SMELL COMING FROM THE FLOOR NEAR 1A DURING CRUISE. THE AIRCRAFT LANDED AT IAH WITHOUT INCIDENT WHERE MAINTENANCE REMOVED AND REPLACED THE CABIN LIGHTING BALLAST IN THE GALLEY, OPERATIONALLY TESTED WITHOUT DEFECT. AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.