As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTING: ALL EXTERIOR EMERGENCY LIGHTS ARE INOP. ALL INTERIOR EMERGENCY LIGHTS ARE INOP IN THE LAVATORY AREA. THE FLOOR STRIP EMER LIGHTING IS INOP, AND THE AFT MOST CABIN OVERHEAD LIGHT IS INOP. TROUBLESHOT TO AFT BATTERY. CONFIRMED THAT A BATTERY HAS BEEN PLACED ON ORDER. WORK IAW CE560XL MM 33-50-00. REPLACED THE AFT EMERGENCY BATTERY PACK WITH AN OVERHAULED ONE. MAINTENANCE IAW CE-560XLS MM 33-50-01.