What was found
CREW REPORT ON AML: BEFORE START GOT (BATT CHARGER INOP) AND (EMER PWR TST FAIL) ALERTS. TROUBLESHOOTING IAW F/M 24-30-03-00 CARRIED OUT. BOTH MAIN REPLACED IAW AMM 24-32-02 IAW MMDC AD. BATTERY CHARGER REPLACED IAW AMM 24-34-03. EPCU REMOVED AND REPLACED IAW AMM 24-32-6. EMERGENCY INVERTER RCCB B1-134 REMOVED AND REPLACED IAW AMM54-50-1. CLEANED AND INSPECTED TERMINALS AT S4-1 SHUNT. REMOVED AND REPLACED BATTERY CHARGER RELAY R2-24 IAW SMP. CARRIED OUT EMERGNCY PWR TEST AND BATTERY TES IAW AMM 24-34-03. ALL OPS NORMAL. AIRCRAFT RELEASED TO SERVICE.