As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - PILOT REPORTED SUDDEN LOSS OF POWER AND SMOKE IN COCKPIT. MAINTENANCE INSTALLED NEW AUDIO ALT ALERTER PANEL BY SECURING CONNECTOR AND FASTENERS. PERFORMED OPERATIONAL TEST IAW DASH 8 200 MM 34-10-00. ALL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.