As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IST - ON CLIMB-OUT, THE FLIGHT CREW NOTICED SMOKE AROMA IN THE COCKPIT. THE SOURCE OF THE SMOKE WAS DETERMINED TO BE THE CAPTAIN'S SEAT CONTROL UNIT ASSEMBLY. THE CAPTAIN'S SEAT CONTROL CIRCUIT BREAKERS WERE PULLED AND THE AIRCRAFT RETURNED TO IST. GROUND MAINTENANCE TROUBLESHOT THE SYSTEM. FOUND FAILED CONTROL UNIT ASSEMBLY. (X)