As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. SEAT MOUNTED EMERGENCY ESCAPE PATH LIGHTS IN THE FIRST CLASS AND EMERGENCY EXIT SIGNS BY THE L1 AND R1 DOORS ARE INOPERATIVE. REMOVED AND REPLACED BATTERY PACK AND CONTROL MODULE (AALA20170919005) AT M10798 PER AMM 33-51-07. OPERATIONAL CHECK GOOD.