As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MKE FLIGHT 3009 - THE CREW REPORTED SMOKE IN THE CABIN AND FLIGHT DECK AT FLIGHT LEVEL 36,000.PRIOR TO SMOKE THERE WAS A (TAT 2 HEAT INOP) MESSAGE. MAINTENANCE INSPECTED AND REPLACED THE NR 2 TAT CURRENT SENSOR RELAY KO494 AND SOCKET XK0494. OPERATIONAL CHECKS WERE GOOD.