As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN EMERG LIGHT: EMERGENCY FLASHING IN CRUISE FLIGHT. SWITCH IN ARM POSITION CABIN EMERGENCY LIGHTS BEGAN FLASHING DURING CRUISE. REMOVE AND REPLACED FWD EMER BATTERY PACK WITH CUSTOMER PROVIDED TESTED BATTERY PACK WORK DONE PER PHENOM 300 AMM 33-52-01 OPS CHECK GOOD AT THIS TIME.