What was found
IAH- DURING MAINTENANCE TEST OF THE EMERGENCY LIGHTING SYSTEM IT WAS NOTED THAR THE FORWARD SECTION OF THE CABIN EMERGENCY LIGHT STRIP FAILED TO ILLUMINATE. MAINTENANCE REMOVED AND REPLACED THE NUMBER 1 EMERGENCY BATTERY, PERFORMED A OPERATIONAL CHECK OF THE EMERGENCY LIGHTING SYSTEM, NO DEFECTS NOTED, AND, THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.