What was found
FIRE - COCKPIT FILLED WITH SMOKE WHILE THE AIRCRAFT WAS ON THE GROUND WITH THE EXTERNAL POWER CONNECTED. FIRE IN FWD E & E COMPARTMENT AT THE EXTERNAL POWER CONNECTOR WAS EXTINGUISHED BY MAINTENANCE. EXTERNAL POWER CORD SHOWS SIGNS OF HEAT DAMAGE ON PIN A. CORRECTIVE ACTION: REPLACED EXTERNAL POWER RECEPTACLE 20XG. ACSC, BSCU, BMC AND CPC WERE REPLACED DUE TO PROXIMITY TO FIRE. (LP 7004466, 1548410 - AIRCRAFT WAS GROUNDED)