What was found
AFTER TAKEOFF, SMOKE IN THE COCKPIT THAT APPEARED TO COME FROM RMI NUMBER 2. SMOKE STOPPED WHEN RADIO MASTER NORMAL SWITCH WAS TURNED OFF. AIRCRAFT RETURNED TO SBA. REPLACED NUMBER 2 RMI. ALSO, INSPECTED ALL WIRES AND OTHER INSTRUMENTS. NO DISCREPANCIES OR DEFECTS NOTED. OPS CHECK GOOD.