As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DUCT TEMP OVERHEAT ANNUNCIATOR FOLLOWED BY SMOKE REPORTED IN CABIN. PERFORMED GROUND RUNS FOR TROUBLESHOOTING AND DUPLICATED PROBLEM. LOWER COOLING TURBINE PASSENGER LOWER COOLING TURBINE PRODUCING A DUCT OVER HEAT AND SMOKE IN CABIN. SUSPECT TURBO COOLER BEARING FAILURE.