What was found
L4 DOOR EXTERIOR SLIDE EMERGENCY LIGHT INOPERATIVE. HAD A GOOD GROUND AT THE SOCKET, NO POWER. REMOVED THE POWER SUPPLY AND BATTERY, ALL FUSES CHECKED OK. TROUBLESHOT IAW WD 33-51-21, CHECKED L397 FOR SHORTS AND OPENS, NONE FOUND, CHECKED BATTERY PACK M739 AND FOUND FUSE SE11 BLOWN (PINS 9 & 10). REPLACED THE FUSE AND IT WOULD BLOW AGAIN, REPLACED THE BATTERY PACK M739 AND ALL EMERGENCY LIGHTS WORK. OK TO CONTINUE.