What was found
WHILE ON THE GROUND AND BOARDING FOR NEXT FLIGHT, SMELLED ELECTRICAL SMOKE & HEARD 2 LOUD BANGS, AIRPLANE WENT DARK WHEN THE APU SHUTDOWN. VISUAL FLAMES NOTED FROM LINE SERVICE. REMOVED & REPLACED APU ASSEMBLY.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
WHILE ON THE GROUND AND BOARDING FOR NEXT FLIGHT, SMELLED ELECTRICAL SMOKE & HEARD 2 LOUD BANGS, AIRPLANE WENT DARK WHEN THE APU SHUTDOWN. VISUAL FLAMES NOTED FROM LINE SERVICE. REMOVED & REPLACED APU ASSEMBLY.