As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
"ELEC" LIGHT ILLUMINATED ON O/H PANEL. GROUNDED - YES. SYS LOGGED "AUX BATT CHGR INOP" MESSAGE, FAULT CLEARED BUT AUX BATTERY CHARGER GREEN "CHARGER" LIGHT IS ONLY DIMLY LIT. AUX BATT IS VERY WARM TO THE TOUCH. REMOVED AND INSTALLED BOTH MAIN AND AUX BATTERIES. REF AMM 24-31-11. PERFORMED OPS TEST STEP I. NO HELP. AUX BATTERY CHARGER REQ REPLACEMENT. REMOVED/INSTALLED NEW AUX BATTERY CHARGER. REF AMM 34-31-31. SYS OPS TESTS NML.