As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING ROUTINE MAINTENANCE, THE CREW REPORTED THAT THE NR 2 SFCU CIRCUIT BREAKER POPPED TWICE AND WERE RESET TWICE. THEY THEN SMELLED SMOKE COMING FROM THE AVIONICS BAY. THE SOURCE OF SMOKE WAS TRACED BACK TO THE SFCU. THE SFCU WAS REMOVED AND WAS FOUND TO HAVE TWO (2) HOLES BURNED THROUGH ON THE SIDE. THE BOX WAS REMOVED FROM THE RACK.