As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT AT 21,000 FEET PILOT REPORTED LITE SMOKE AND FUMES IN THE FLIGHT DECK AND CABIN. MAINTENANCE TROUBLESHOOTING. POSSIBLE ACM AND HEAT EXCHANGER REPLACEMENT. AIRCRAFT IS REQUESTED FOR TEST FLIGHT AFTERWARDS. 10/5/04 MAINTENANCE REMOVED AND REPLACED THE DUAL HEAT EXCHANGER AND THE AIR CYCLE MACHINE. HEAT EXCHANGER P/N 778683-2, S/N REMOVED 9802020.