As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX FLIGHT NR 2256, LOST GROUND POWER AND THE AUDIO ALT ALERT CIRCUIT BREAKER TRIPPED AND THE CENTER CONSOLE BEGAN TO SMOKE. MAINTENANCE REPLACED THE ALT ALERTER PANEL WITH NEW RESET CIRCUIT BREAKER. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.