As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER BLOCKING OUT -MAIN BATTERY DISCHARGE- ADVISORY MESSAGE DISPLAY, WITH A -12 AMP DISCHARGE ON MAIN BATTERY. CYCLED STBY POWER SW ON OVERHEAD AND DISCHARGE DECREASED TO -2 AMP WITH 24 VDC ON MAIN BATTERY. REPLACED MAIN BATTERY CHARGER, OP CHECKED OK FOR SERVICE.