As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PRE-FLIGHT RUN UP, CREW NOTICED SMOKE IN THE COCKPIT COMING FROM THE LT SUB-PANEL AND THE RMI FLAGGED INOPERABLE. AFTER FINISHING THE RUN-UP, THEY RETURNED TO THE GATE AND NOTIFIED MAINTENANCE. AFTER ACFT FERRIED TO MKE WITHOUT INCIDENT, MAINT INSPECTED THE AIRCRAFT AND FOUND THE RMI TO BE THE CAUSE OF THE SMOKE. THE RMI WAS REPLACED AND THE AIRCRAFT WAS RETURNED TO SERVICE. (X)