As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI-OUT, CREW REPORTED THE EMERGENCY EXIT LIGHTS OVER SEAT ROWS 22DEF ILLUMINATED. MAINTENANCE FOUND THE BATTERY PACK ASSEMBLY M1137 SHORTED. REMOVED AND REPLACED BATTERY PACK ASSEMBLY PER MM 33-51-02. OPERATIONAL CHECK NORMAL.