As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 2339 - EN ROUTE ORD-DFW, AFTER TAKEOFF CABIN FILLED WITH SMOKE. LEFT SIDE TEMPERATURE HIGH LIGHT ILLUMINATED. RETURNED ORD AND LANDED WITHOUT FURTHER INCIDENT. REPLACED LEFT SIDE COOLING TURBINE ASSEMBLY. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)