As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW OBSERVED A BURNING ODOR IN THE COCKPIT FOLLOWED BY LIGHT SMOKE WHILE ON APPROACH TO SDF. RED FLAGS WERE OBSERVED ON TRI, CAPTAIN'S SIDE. THE SMOKE DISSIPATED AND THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE RAT/TRI INDICATOR AT FAULT. THE RAT/TRI INDICATOR WAS REMOVED AND REPLACED IAW MM 34-15-2. THE PACKS WERE RUN AND NO ODORS WERE NOTED.