What was found
AIRCRAFT WAS GROUNDED: DURING PERIODIC SERVICE CHECK OPERATIONAL TEST OF EMERGENCY LIGHTING SYSTEM FAILED. FLIGHT ATTENDANT PANEL MESSAGE EMERGENCY POWER SUPPLY UNIT EXTERNAL LOAD FORWAERD LEFT. MAINTENANCE FOUND THE L1 DOOR SLIDE TO BE DEFECTIVE AND REPLACED THE SLIDE. (AALA202403083366) MAINTENANCE ALSO RE-PINNED WIRE 33-51-5099 AT GROUND BLOCK 2505VG (AALA202403084007). A SATISFACTORY BITE TEST OF THE EMERGENCY POWER SUPPLY UNIT WAS ACCOMPLISHED.