As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT THE CABIN EMERGENCY LIGHTS WERE FLASHING ON AND OFF. AFTER LANDING, WITH GROUND POWER APPLIED, THE CABIN EMERGENCY LIGHTS ARE ON STEADY WITH THE EMER LT SWITCH IN ARM. PERFORMED ISOLATED FUNCTIONAL CHECK OF EMERGENCY LIGHT BATTERY PACKS, NOTED THE #2 BATTERY TO BE DEAD. REMOVED AND REPLACED #2 EMERGENCY LIGHT BATTERY WITH A TESTED UNIT IAW PHENOM 300 AMM 33-52-01. OPERATIONAL CHECKS GOOD.