As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHT ON THE LT SIDE OF FUSELAGE JUST ABOVE PANEL 191EL INOPERATIVE. TROUBLESHOOTING THROUGH IAW FIM 33-50-00-810-804-A, FOUND A FAILURE OF THE BATTERY CHARGER. REPLACED THE BATTERY CHARGER, REPLACED THE POWER SUPPLY. BATTERY POWER SUPPLY TESTED GOOD IAW AMM 33-50-04.