As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERG LIGHT SWITCH: AFTER TAKEOFF WE NOTICED ALL OF THE EMERGENCY LIGHTS ON WITH THE SWITCH IN THE ARM POSITION. THE LIGHTS STAYED ON UNTIL THE SWITCH WAS TURNED OFF UPON SHUTDOWN. CORRECTIVE ACTION: REPLACED EMERGENCY BATTERY. OPS CHECK GOOD. PHENOM 300 AMM 33-52-01-400-801-A