As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEX - FLT 3376 - EN ROUTE, THE LT BATTERY TEMP WARNING LIGHT ILLUMINATED. THE CREW DISCONNECTED THE LT BATTERY AND THE TEMPERATURE RETURNED TO NORMAL. THE AC RETURNED TO DTW. MAINTENANCE REPLACED THE LT BATTERY. SYSTEM OPERATED SATISFACTORILY. (W)