As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CVG - FLT 1501 - EN ROUTE CVG-DFW, ELECTRICAL FUMES REPORTED BY AFT FLIGHT ATTENDANT FIVE MINUTES AFTER TAKEOFF. RETURNED TO CVG AND LANDED WITHOUT INCIDENT. REPLACED AVIONIC OUTLET VALVE PER MM. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)