As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH THE EMER LIGHT SWITCH IN THE ON OR ARM POSITION AND THE BATTERIES OFF, NONE OF THE EMER LIGHTS WILL ILLUMINATE. REMOVED AND REPLACED NO.4 EMERGENCY BATTERY PACK IAW MM 33-50-06. REMOVED AND REPLACED NO.1 EMERGENCY BATTERY PACK IAW MM 33-50-06. ACCOMPLISHED EMERGENCY LIGHTING OPERATIONAL CHECK IAW MM 33-50-00. OPS CHECK GOOD.