As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DAILY CHECK DISCOVERED APU CHARGER INOPERATIVE. DURING DAILY CHECK DISCOVERED APU BATTERY LOW VOLTAGE. AFTER ONE HOUR OF APU OPERATION, DISCOVERED APU BATTERY CHARGER STATUS MESSAGE. UNABLE TO CLEAR MESSAGE. REMOVED AND REPLACED APU BATTERY CHARGER IAW AMM 24-31-05, OPS CHECK GOOD. REMOVED AND REPLACED APU BATTERY IAW AMM 24-31-04. OPS CHECK GOOD. REMOVED AND REPLACED APU BATTERY CHARGER SYSTEM. OPS CHECK GOOD AT THIS TIME IAW AMM 24-31-05.