As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX FLIGHT 2096, WHILE ON GROUND POWER GPU DIED CAUSING AUDION SLT CIRCUIT BREAKER TO POP. CAN ALSO ODOR OF BURNING WIRING NEAR CAPT CIRCUIT BREAKER PANEL. MAINTENANCE INSPECTED AND FOUND ALT ALERT AUDIO PANEL BURNED. REPLACED ALT ALERT AUDION PANEL. OPERATIONAL CHECK GOOD IAW AMM TASK 34-11-41-710-801. NO FURTHER DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE.