What was found
CLE - FL2636 - CAPTAIN STATED THAT THE NR 4 LEADING EDGE SLAT AMBER LIGHT ILLUMINATED ON INITIAL APPROACH. CREW CONFIRMED VISUALLY THAT THE SLAT WAS NOT FULLY EXTENDED AND DECLARED AN EMERGENCY. AFTER ABOUT 5 MINUTES AT FLAPS 15, THE SLAT DID FULLY EXTEND. FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REMOVED AND REPLACED THE NR 4 LEADING EDGE SLAT ACTUATOR PER MM 27-81-41. OPERATIONAL CHECK AND LEAK CHECK GOOD. (M)