As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD INFLIGHT - FLIGHT ATTENDANT REPORTED ELECTRICAL SMELL/HAZE AFTER TAKEOFF. RETURNED TO ORD AND LANDED WITHOUT INCIDENT. DURING TAXI IN EQUIPMENT COOLING OVERHEAT LIGHT ILLUMINATED. REPLACED EQUIPMENT COOLING FAN. SYSTEM GROUND CHECKED NORMAL OPERATION.