As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PREFLIGHT OF THE EMERGENCY LIGHTS, RECEIVED A LEVEL 1 ALERT FOR THE EMERGENCY LIGHT BATTERY 1 LOW. REMOVED AND REPLACED THE EMERGENCY LIGHTING BATTERY POWER SUPPLY IAW MM 33-51-01-4. OPS CHECKED NORMAL IAW MM 33-51-01-5. OK FOR SERVICE.