What was found
DURING FINAL DECENT SMOKE WAS NOTICED COMING FROM BELOW THE INSTRUMENT PANEL. AFTER NORMAL LANDING, AIRCRAFT WAS SECURED AND CREW EXITED. FURTHER INVESTIGATION REVEALED A BURNED ANCILLARY SERVICE UNIT CIRCUIT CARD. THE COCKPIT NIGHT LIGHTING MODE, WHICH WAS SELECTED JUST PRIOR TO APPROACH, IS CONTROLLED BY THIS CIRCUIT CARD.