What was found
RETURNED TO FIELD UNDER AMBER ALERT, DUE TO ELECTRICAL BUS AND GENERATOR PROBLEMS. REPLACED NR 2 AND 3 GENERATORS, CSD'S, GCU'S, AND BCU'S. ROOT CAUSE OF INCIDENT UNDER INVESTIGATION. NR 3 ENG CSD EXPERIENCED INTERNAL FAILURE CAUSING ITS GEN TO GO INTO INCREASING SPEED CONDITION, ENDING IN FAILURE OF CHANNELS 2 AND 3. UA RECOMMENDS UPGRADE OF GCU TO -17, TO ADD OVER FREQUENCY PROTECTION.