What was found
AT 6000 FT, DURING DESCENT, AIRPLANE WENT INTO EMERGENCY ELECTRICAL MODE. REMOVED & REPLACED GLC 1 & 2 WITH NEW UNITS IAW AMM 24-65-03, NO DEFECTS NOTED. REMOVED AND REPLACED, GCU 1 WITH AN INSPECTED UNIT, GCU 2 WITH AN OVERHAULED UNIT, IAW AMM 24-31-02, NO DEFECTS NOTED. CW OPS TEST OF THE ELECTRICAL EMERGENCY TRANSFER CIRCUIT, NO DEFECTS NOTED, IAW AMM 24-61-00. CW MAIN DC GENERATION OPS TEST, NO DEFECTS NOTED, IAW AMM 24-31-00. CW DC POWER DISTRIBUTION SYSTEM OPS TEST, NO DEFECTS NOTED, IAW AMM 24-61-00. CW GCU FT, NO DEFECTS NOTED, IAW AMM 24-31-02. CW MAIN BATTERY SYSTEM OPS TEST, NO DEFECTS NOTED, IAW AMM 24-36-00.