As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JFK - CREW REPORTED LEFT NUMBER 4 DOOR OPEN WARNING INDICATION DURING CLIMB OUT. EMERGENCY DECLARED RETURNED JFK LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. ADJUSTED DOOR STOP PINS AND LOWER AND UPPER GATES. PRESSURIZED AIRCRAFT AND CHECK OF DOOR HANDLE SHOWED NO MOVEMENT. SYSTEM GROUND CHECK NORMAL OPERATION.