What was found
FLT 5129 - DURING CRUISE, FLIGHT CREW NOTED LIGHT SMOKE AND BURNING ELECTRICAL SMELL IN COCKPIT. ADDITIONALLY, NR 2 DME CIRCUIT BREAKER POPPED. SMOKE APPEARED IN VICINITY OF CAPTAIN'S OVERHEAD MAP LIGHT. NON-ESSENTIAL OVERHEAD LIGHTING WAS SWITCHED OFF. DME CIRCUIT BREAKER WAS NOT RESET. SMOKE AND SMELL DISSIPATED. FLIGHT CONTINUED TO DESTINATION WITHOUT FURTHER INCIDENT. MAINTENANCE PERSONNEL FOUND NR 2 DME INTERROGATOR TO HAVE EVIDENCE OF OVERHEATING. FURTHER INVESTIGATION FOUND NO FURTHER EVIDENCE OF DAMAGE. REPLACEMENT INTERROGATEOR NOT AVAILABLE. CIRCUIT BREAKER REMAINED PULLED. COLLARED BREAKER AND ASSIGNED DEFERRAL PER MEL. (M)