As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ELEC LIGHT ILLUMINATED AFTER START. GROUNDED - YES. ACCOMPLISHED B737-800 FIM 24-31 TASK 801, BITE SHOW AUX BATT CHARGER FAULT. ACCOMPLISHED FIM 24-31 TASK 825 BATTERY CHARGER FAULT AND DISCHARGE CHECK, FAULT WILL NOT CLEAR AND REMAINS INOP. REMOVED AND REPLACED AUX BATTERY CHARGER PER B737-800 AMM 24-31-31, OPS CHECK OK. ELECT LIGHT CLEARED AND NO FAULTS SHOWING.