As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED A PUFF OF SMOKE FROM BEHIND THE COPILOT SEAT AND A BURNED ELECTRICAL ODOR DURING DESCENT INTO CMH. REMOVED COCKPIT ZONE TEMPERATURE SENSOR/FAN ASSY COVER AND FOUND TRACE EVIDENCE OF SMOKE MARKS. SUSPECT THAT FOD WAS TRAPPED IN THE ZONE TEMPERATURE FAN ASSY AND CAUSED SMOKE. REMOVED AND INSTALLED A NEW COCKPIT ZONE TEMPERATURE SENSOR P/N: 9914130-6 AND FAN ASSY P/N: 414F. (S)