As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. EMERGENCY EXIT SIGNS BY THE R3 DOOR OVERHEAD AND AFT AND BY THE L3 DOOR OVERHEAD, FORWARD AND AFT ARE INOPERATIVE. REMOVED AND REPLACED POWER SUPPLY (BATTERY PACK) AT M33406 PER AMM 33-51-06. OPERATIONAL CHECK GOOD.