As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING FIRE FIGHTING OPERATIONS THE NUMBER 2 POSITION VHF TRANSCEIVER HAD FAILED. THE PILOT SMELLED SMOKE IN THE COCKPIT AND TURNED OFF THE RADIO. THE AIRCRAFT RETURNED TO YKA. THE SOURCE OF THE SMOKE WAS INVESTIGATED AND FOUND TO BE FROM THE NUMBER 2 VHF RADIO. THE RADIO WAS REPLACED WITH A SERVICEABLE UNIT.