As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) FLIGHT FROM WAS DIVERTED DUE TO SMOKE IN THE CABIN. MAINTENANCE WAS DISPATCHED AND FOUND THE CABIN TEMP CONTROL BOX WAS BURNT FROM AND OVER HEATED DIODE. THE SYSTEM DEFERRED UNDER MEL AND AIRCRAFT RETURNED. THE TEMP CONTROL SYSTEM WAS TESTED, THE CONTROLLER REPLACED AND THE SYSTEM CHECK SERVICEABLE