What was found
NR 2 DC GENERATOR WARNING LIGHT ILLUMINATED IN FLIGHT LINE MX INVESTIGATION/TROUBLESHOOTING IDENTIFIED THAT THE STARTER/GENERATOR COOLING FAN HAD LIBERATED FROM THE AFT END OF THE UNIT. ALL DAMAGED PARTS WERE ACCOUNTED FOR WITHIN THE ENGINE BAY. THE FAILED UNIT INCLUDING THE DAMAGED COOLING DUCT WAS REPLACED & FOLLOWING APPROPRIATE GROUND CHECKS IAW MM THE AIRCRAFT HAS BEEN RETURNED TO SERVICE WITHOUT FURTHER INCIDENT. ALTHOUGH NOT CONFIRMED THE PROBABLE ROOT FAILURE OF THE STARTER/GENERATOR`S OPERATION IS DUE OVERHEATING FOLLOWING LIBERATION OF THE COOLING FAN.