As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN EMERG LIGHT: WITH BATTERY SWITCH OFF, EMER SWITCH ON, THE FROMT EMER LIGHTS ARE ALL DEAD. WITH BATTERY SWITCH ON ALL LIGHTS WORK NORMAL//CORRECITVE ACTION// R/REMERGENCY BATTERY WITH CUSTOMER SUPPLIED SERVICEABLE BATTERY. OPS CHECK GOOD REF CE560XL AMM 33-50-01