As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF ROLL; EMER EXIT LIGHTS AT ROW 6; 10 & 14 (F/O SIDE) ILLUMINATED ON (UNCOMMANDED). SHORTLY AFTER TAKEOFF THEY EXTINGUISHED. REMOVED AND REPLACED BATTERY PACK ON ROW 7DEF (M1676) PER AMM 33-51-06.OPS CHECK GOOD THE FAULT ON GROUND COULD NOT BE DUPLICATED.