What was found
SMOKE AND FUMES MOMENTARILY APPEARED IN THE COCKPIT DURING A STANDBY POWER CHECK WHILE AIRCRAFT WAS AT GATE. MAINTENANCE FOUND THE APU GENERATOR CONTROL UNIT AT FAULT. THE APU GCU WAS REMOVED AND REPLACED, GROUND CHECK WAS GOOD.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
SMOKE AND FUMES MOMENTARILY APPEARED IN THE COCKPIT DURING A STANDBY POWER CHECK WHILE AIRCRAFT WAS AT GATE. MAINTENANCE FOUND THE APU GENERATOR CONTROL UNIT AT FAULT. THE APU GCU WAS REMOVED AND REPLACED, GROUND CHECK WAS GOOD.