As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JFK - NOSE GEAR WOULD NOT RETRACT. EMERGENCY DECLARED, RETURNED TO JFK WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND LOCKING MECHANISM ON NOSE GEAR TELESCOPIC STRUT ROTATED TO THE LOCKED POSITION. RESET LOCKING MECHANISM TO NORMAL POSITION. SYSTEM GROUND CHECK NORMAL OPERATION.