As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX/RDM - FLT 7004 - ON APPROACH INTO RDM, THE CREW NOTICED SMOKE COMING FROM THE CIRCUIT BREAKER PANEL IN THE AREA OF THE ENVIRONMENTAL CIRCUIT BREAKERS. THE FIRST OFFICER PULLED THE ENVIRONMENTAL PRESSURE CIRCUIT BREAKER AND THE SMOKE STOPPED. MAINTENANCE INSPECTED AND FOUND THE ENVIRONMENTAL PRESSURE CIRCUIT BREAKER HAD FAILED, AND DEFERRED PER MEL 21-9. AIRCRAFT WAS RETURNED TO SERRVICE. IN SUBSEQUENT MAINTENANCE, THE ENVIRO CIRCUIT BREAKER WAS REMOVED AND REPLACED. (X)