As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BATTERY CHARGER MAIN EICAS STATUS MAIN BATTERY CHARGER FAILURE. REPLACED APU BATTERY CHARGER. OPS CHECK GOOD. REF AMM 24-31-06-401. ROTABLE PARTS CHANGE WAS INDICATED - TT 1355130 SN OFF 1252 CHARGER, BATTERY OFF 25-2431-9-0002 1252 ON 25-2431-9-0002 1240 WAS NOT APU CHARGER PART CHANGED WAS MAIN BATTERY CHARGER.