As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, THE CREW REPORTED LIGHT SMOKE IN THE COCKPIT AT ABOUT 7,000FT. THE CREW DECLARED AN EMERGENCY AND RETURNED TO KORD, LANDING WITHOUT INCIDENT. EMERGENCY PERSONNEL MET THE AIRCRAFT AND THE PLANE WAS EVACUATED. MAINTENANCE FOUND BROKEN BLADES ON THE NR 1 AIR CYCLE MACHINE. THE NR 1 AIR CYCLE MACHINE WAS REPLACED AND NO FURTHER OCCURRENCES HAVE BEEN NOTED.