What was found
(CAN) INSTRUCTOR AND STUDENT ON BOARD, TRAINING FLT. NOTICED ODORS AND A LITTLE SMOKE SEEMINGLY TO COME FROM JUST BY CO-PILOTS POSITION, UNDER PANEL. ALL ELECTRICS SWITCHED OFF. MINIMUM ELECTRICS ON, NO FURTHER PROBLEMS, RETURNED TO BASE. A/C INSPECTED, NO FAULTS FOUND. ALL SYSTEMS APPEARED OK. AIRCRAFT RELEASED. AIRCRAFT DISPATCHED. DURING PRE-FLIGHT, NOTED THAT INTERCOMM ON PILOTS SIDE UNSERV ICEABLE. (HAD BEEN REPORTED SERVICEABLE ON PREVIOUS TRIP TO BASE.) INTERCOMM REPLACED AND FUNCTION CHECKED SERVICEABLE. NOTICED AT THIS TIME, THE NR 2 COMM DIGITAL DISPLAY WORKED BUT THIS RADIO WOULD NOT TRANSMIT.