As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT DEPARTED, AFTER TAKEOFF, CREW REPORTED SMOKE IN THE COCKPIT AND THAT THE NR2 COM CIRCUIT BREAKER HAD TRIPPED. ACFT RETURNED TO DEPARTURE. LANDING NORMAL. MX DISCOVERED THE NR2 AUDIO CONTROL PANEL DEFECTIVE. REPLACED DEFECTIVE AUDIO CONTROL. (CLOSED)