As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JFK - FLT 9579 - AFTER TAKEOFF JFK, LANDING GEAR WOULD NOT RETRACT. AIRCRAFT RETURNED TO JFK AND LANDED WITHOUT INCIDENT. REPLACED LEFT MAIN LANDING GEAR 9GA AND 8GA POSITION SENSORS AND SUPPORT BRACKETS. ACCOMPLISHED LANDING GEAR RETRACTION CHECK WITH NO DEFECTS FOUND. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)