As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JFK - INFLIGHT ORD-LGA. CREW REPORTED LEFT HYDRAULIC SYSTEM QUANTITY VERY LOW. EMERGENCY DECLARED FLIGHT DIVERTED JFK LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND SPOILER SHUT OFF VALVE CRACKED. REPLACED VALVE. SYSTEM GROUND CHECK NORMAL OPERATION.