As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT AT APPROXIMATELY 14,000 FT, A SUDDEN AND STRONG BURNING SMELL WITH A HAZE OF SMOKE FILLED COCKPIT. INSPECTION OF AIRCRAFT FOUND CIRCUIT CARD FAILURE IN CABIN TEMPERATURE CONTROLLER IN CABIN CEILING. UNIT WAS REPLACED AND SYSTEM CHECKED SATISFACTORY IAW CHAPTER 21. (M)