As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERG LT TURNED ON IN FLIGHT. ONLY ILLUMINATED THE FIRST ROW IN THE CABIN , THE COCKPIT JS, AND FA JS.-C/A-REMOVED AND REPLACED #1 (FWD) BATTERY PACK AND POWER SUPPLY AS PER AMM 33-50-04. OPS CHECK OK AS PER AMM 33-50-00. BATTERY CHARGER ASSY P/N 11-0049 S/N 24450