As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BATTERY DISCHARGED MAIN, EICAS ADVISORY MESSAGE DISPLAYED. MAIN BATTERY IS IN DISCHARGE CYCLE. MAIN BATTERY SHOWING 8 AMPS DISCHARGE AFTER STANDBY POWER CHECK. REPLACED MAIN BATTERY AND MAIN BATTERY CHARGER. NOW BOTH OPS NORMAL AFTER STANDBY POWER CHECKED, NO DISCHARGE.