What was found
(CAN) IN FLIGHT, THE FLIGHT CREW NOTICED SMOKE EMITTING FROM THE COCKPIT OVERHEAD PANEL. THE ELECTRICAL SMOKE PROCEDURE CHECKLIST WAS CARRIED OUT AND THE SMOKE CEASED. THE CREW COMPLETED A FUEL DUMP BEFORE RETURNING TO BASE FOR AN UNEVENTFUL LANDING. MAINTENANCE FOUND A BURNT RING TERMINAL CONNECTOR ON A LAMP DIMMER MODULE IN THE OVERHEAD PANEL. THE TERMINAL CONNECTOR, DIMMER MODULE AND ASSOCIATED CIRCUIT BREAKERS WERE REPLACED, AND THE AIRCRAFT WAS RETURNED TO SERVICE. ALL SUBSEQUENT OPERATIONS WERE NORMAL .