What was found
AIRCRAFT WAS GROUNDED: DURING L-4 DOOR SLIDE REPLACEMENT THE EMERGENCY LIGHTING SYSTEM FAILED THE CIDS EMERGENCY POWER SUPPLY UNIT SYSTEM BITE TEST PER TASK CARD 26L00025010. CIDS REFLECTED DECODER ENCODER UNIT FAULT. REPLACED EMERGENCY POWER SUPPLY UNIT (AALA202206150240) AND BATTERY (AALA202206155571) PER AMM 33-51-38. REPLACED DECODER ENCODER UNIT B (DEU) PER AMM 23-73-47 (AALA202206154564). CLEANED CONNECTOR 2872VC END AND RE-SECURED CONNECTOR (AALA202206150320). A SATISFACTORY OPERATIONAL CHECK OF THE EMERGENCY LIGHTING SYSTEM WAS ACCOMPLISHED PER AMM 33-51-00.