What was found
AIRCRAFT IN BASE MAINTENANCE: EMERGENCY LIGHT SYSTEM FAILED OPERATIONAL CHECK. **SUPPLEMENTAL REPORT FOR AALA202110157394: TROUBLESHOOTING FOUND THE RESISTANCE OUT OF LIMITS ON THE L1, R1 AND L4 DOOR SLIDES WHICH WERE NEW AND INSTALLED DURING THIS MAINTENANCE VISIT ALONG WITH THE EMERGENCY POWER SUPPLY UNIT BATTERIES DEFECTIVE AT THE LEFT-HAND MIDDLE AND AFT POSITIONS. REPLACED THE L1 DOOR SLIDE, R1 DOOR SLIDE (AALA202110212670) AND THE L4 DOOR SLIDE (AALA202110212793) PER AMM 25-62-44. REPLACED THE MIDDLE LEFT HAND EMERGENCY POWER SUPPLY UNIT BATTERY (AALA202110212568) AND THE AFT EMERGENCY POWER SUPPLY UNIT BATTERY PER AMM 33-51-38-400-002-A (AALA202110210094). ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 33-51-00-710-001-A **(CLOSED).