What was found
DURING SERVICE CHECK NOTED LT EXTERIOR EMER BATTERY POWERED LIGHT INOPERATIVE, NEXT TO L1 DOOR. RELEASED FOR SERVICE IAW MEL 33-51-02-02. REPLACED EXTERIOR EMER LIGHT BULB IAW AMM 33-51-06-2-1. AFTER THAT WORKED IAW FIM 33-51 FAULT TREE 803. ACCORDING TO STEP 20 CHECKED POWER SUPPLY FUSES & THEY WERE GOOD, AMM 33-51-07 201. AT NEXT USED ANOTHER BATTERY PACK FOR TROUBLESHOOTING PURPOSES ONLY WITH NO HELP. REINSTALLED ORIGINAL BATTERY PACK. IAW FIM 33-51 FAULT TREE 803 THE POWER SUPPLY NEEDS TO BE REPLACED, NO BATTERY SUPPLY AT BCN STATION. LOOK TO ATA 33-50 WRI 6964 FOR THE INTERIOR EMER BATTERY POWERED LIGHT & ATA 52-20 WRI 6965 FOR THE L1 DOOR CONSIDERED INOPERATIVE DUE TO THE PRESENT MEL 33-51-02-02. EXTERIOR EMER BATTERY POWERED LIGHT INOPERATIVE. R & R L1 DOOR EMER LIGHTS POWER SUPPLY IAW MM 33-51-07-2, ALL CHECKED SATISFACTORY.