What was found
AFTER STARTING NR 2 ENGINE NOTICED DISCHARGE OF BATTERIES FOLLOWED BY OBSERVATION OF SMOKE FROM GPU RECEPTICAL. INSPECTED AND FOUND GROUND POWER UNIT PLUG MALFUNCTIONED. CLEANED RECEPTICAL AND REMOVED AND REPLACED PLUG.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AFTER STARTING NR 2 ENGINE NOTICED DISCHARGE OF BATTERIES FOLLOWED BY OBSERVATION OF SMOKE FROM GPU RECEPTICAL. INSPECTED AND FOUND GROUND POWER UNIT PLUG MALFUNCTIONED. CLEANED RECEPTICAL AND REMOVED AND REPLACED PLUG.