As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT 801 ON FLIGHT 5098 FROM CLT to LEX : During preflight the aircrew could not get the aft ceiling interior and exterior emergency lights to test. Maintenance removed and replaced the battery packs and resequred a loose connection at the Power Supply. System ops checked good and aircraft was returned to service.