As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN EMERG LIGHT: OVERHEAD CABIN LIGHTS FLASHING WHILE INFLIGHT WITH EMERG LIGHTS ARMED.//CORRECTIVE ACTION// REMOVED AND REPLACED REAR MAIN BATTERY PN 7638-48P SN G030133027 AND INSTALLED NEW CUSTOMER SUPPLIED REAR MAIN BATTERY PN PN 7638-48P SN G03139823 OPS CHECK GOOD. REF PHENOM 300 MM 24-36-01