As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER TAKEOFF, A WISP OF SMOKE AND A BURNING SMELL WAS DETECTED IN THE COCKPIT BY THE CREW. PRECAUTIONARY LANDING WAS CARRIED OUT SUBSEQUENT MAINTENANCE TROUBLE SHOOTING REVEALED THE PROBLEM WAS LOCATED IN THE RIGHT HAND SPEAKER AND WAS DUE TO A PARTIALLY SHORTED TRANSFORMER OVERLOADING A RESISTOR.