What was found
JFK INFLIGHT T1582/15SEP - LEADING EDGE SLATS WOULD NOT EXTEND ON LANDING. AIRCRAFT DECLARED AN ALERT NUMBER 8. LANDED WITHOUT INCIDENT. REPLACED NUMBER ONE LEADING EDGE SLAT JACKSCREW TRANSMISSION ON RIGHT WING, NUMBER ONE, TWO, THREE, AND FIVE LEADING EDGE SLAT JACKSCREW LEFT WING. SYSTEM GROUND CHECKED NORMAL OPERATION.