What was found
REPEATED ELECTRICAL POWER AND SUPPLY PROBLEMS WITH THIS AIRCRAFT REVEALED A LOOSE GALLEY GROUND WIRE CONNECTION. FURTHER INVESTIGATION FOUND INDICATIONS OF ARCING AND FIRE/SMOKE DAMAGE. *S/D* DISCOVERED WIRE W3666000410 WAS NOT CONNECTED SECURELY TO AIRCRAFT GROUND. WIRE WAS INSTALLED ON THE TERMINAL WITHOUT A RETAINING NUT. ALSO, A NEW DELIVERED AIRCRAFT WAS RECEIVED IN SIMILAR CONDITION. REPLACED WIRE AND CORRECTED DAMAGE, OPERATION CHECKS NORMAL.