As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JFK - INFLIGHT MIA-LGA. CREW REPORTED SPOILER EICAS MESSAGE. DIVERTED TO JFK LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND SPOILER CONTROL MODULE M535 STUCK IN TEST MODE AND COULD NOT SHUT OFF. REPLACED MODULE. SYSTEM GROUND CHECKED NORMAL OPERATION.