What was found
THE AIRCRAFT WAS IN THE PROCESS OF RETURNING BACK TO THE AIRPORT DUE TO AN ADG DROP. TURNED AROUND TO FACE THE CUSTOMERS AND SAW SPARKS OUT OF THE CORNER OF MY EYE AND SMOKE BEGAN TO LIGHTLY COME OUT FROM THE AREA OF THE FLIGHT ATTENDANT PANEL/PHONE AND GO TOWARDS THE FLIGHT DECK. PRELIMINARY FINDINGS HAS ATTRIBUTED THE SMOKE WAS CAUSED BY THE EXTERNAL POWER MONITOR (PN EP361) (DESIGNATOR A2XB). CONNECTOR FOUND BURNED.