As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ELEC LIGHT ILLUMINATED ON THE OVERHEAD PANEL. ACFT GROUNDED. VERIFIED FAULT, FOUND AUX BATTERY CHARGER INOPERATIVE IAW FIM 24-31 TASK 801. REPLACED THE AUX BATTERY CHARGER. ACCOMPLISHED AN AUX BATTERY CHARGER TEST, TEST PASSED IAW AMM 24-31-31-710-801, & 24-31-31-400-801.