As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JFK INFLIGHT T1299/11JUN. CREW REPORTED RED MAIN LANDING GEAR DOOR INDICATION AFTER TAKEOFF. RETURNED TO JFK AND LANDED WITHOUT INCIDENT. REPLACED LANDING GEAR PROXIMITY SENSOR LINK ASSEMBLY. SYSTEM GROUND CHECKED NORMAL OPERATION. (A)