What was found
DURING FLIGHT 3329, ARC AT GPU PLUG UPON START UP CAUSED FIRE ON PLUG AND RECEPTACLE. NR 2 ENGINE WAS BEING STARTED AND CREW SHUTDOWN ENGINE WITHOUT FURTHER INCIDENT. PAX CABIN WAS EVACUATED AND FLIGHT CREW FIRE EXTINGUISHER USED TO PUT OUT FIRE. MAINTENANCE UPON INSPECTION NOTED MINOR DAMAGE ON EXTERIOR OF GPU RECEPTACLE WITH NO DAMAGE EXTENDING UPSTREAM. REMOVED AND REPLACED GPU RECEPTACLE IAW SAAB MM 244305 PN MS3506-1. ALL CHECKS GOOD AT THIS TIME.