As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ACCOMPLISHMENT OF B-CHECK WORK CARD 0617, DISCOVERED WHEN THE EMERGENCY LIGHTS WERE SELECTED TO THE ON POSITION, THE EMERGENCY LIGHTS ABOVE THE AFT OVERWING EXITS WERE INOPERATIVE. THE PROBLEM WAS TROUBLESHOT TO THE B5-25 BATTERY PACK. THE BATTERY PACK WAS REPLACED WITH BATTERY POWER SUPPLY P/N 60-0304-31, S/N 17016, AND THE EMERGENCY LIGHTS WERE OPERATIONAL CHECKED OK IAW DOUGLAS MM 33-53-0. (X)