As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING GROUND TEST OF EMERGENCY LIGHTING SYSTEM INSPECTION OF THE AIRCRAFT REVEALED THE RT EXTERIOR EMERGENCY LIGHTS ABOVE THE R-1, 2 AND 3 DOORS FAILED TO ILLUMINATE AS REQUIRED. REMOVED AND REPLACED THE DEFECTIVE BATTERY PACK PER THE AMM CHECKED THE SYSTEM AS REQUIRED OPS CHECK GOOD. AIRCRAFT IS OK FOR SERVICE.