As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE BEGAN COMING FROM THE F/O'S RMI WHILE EN ROUTE TO ATL. THE APPROPRIATE C/B WAS PULLED AND THE SMOKE CEASED. THE AIRCRAFT LANDED SAFELY AT ATL WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND THE RMI AT FAULT. THE F/O'S RMI/DME(DUAL UNIT) WAS REMOVED AND REPLACED IAW MM 34-28-81. A SYSTEM TEST WAS PERFORMED AND OPERATION CHECKED NORMAL. ALL C/P'S AND WIRES WERE INSPECTED WITH NO DEFECTS NOTED.