As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4361, CREW ELECTED TO RETURN TO ORD DUE TO ELECTRICAL ODOR IN CABIN. AIRCRAFT REMOVED FROM SERVICE. REMOVED AND REPLACED BALLASTS OPERATIONAL CHECK GOOD. PERFORMED A FUNCTIONAL CHECK FLIGHT WHICH PASSED SATISFACTORY. AIRCRAFT RETURNED TO SERVICE.