As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING OPERATIONAL TEST OF EMERGENCY LIGHTS , A INOPERATIVE LIGHTS WERE FOUND INOPERATIVE. TROUBLESHOOTING WAS PERFORMED IAW FIM 33-51-00 AND BATTERY PACK 3 WAS REMOVED AND REPLACED WITH SERVICEABLE BATTERY PACK IAW AMM 33-51-17. TEST OK. INSTALLATION AND REASSEMBLY OF CEILING FS677 TO FS693 WAS PERFORMED IAW AMM 33-51-17.