As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN EMERG LIGHT: WITH THE BATTERY SWITCH OFF THE AFT EMERGENCY LIGHTS INCLUDING THE OVER WING LIGHTS ARE INOP. WITH THE BATTERY SWITCH ON ALL EMERGENCY LIGHTS WORK NORMAL// CORRECTIVE ACTION// R/R AFT EMER BATTERY WITH REF TO CE-560XLS AMM 33-50-01. CHARGED BATTERY FOR 2.5 HOURS AND PERFORMED OPERATIONAL CHECK OF EMERGENCY LIGHT SYSTEM, OPS CHECK GOOD.