As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5262 - ON DESCENT INTO JFK RECEIVED PROX SYSTEM CAUTION MESSAGE. EMERGENCY DECLARED, MESSAGE WENT OUT BELOW 200 KTS AND BEFORE GEAR EXTENSION. ALL INDICATIONS WERE NORMAL DURING LANDING. INSPECTED PSEU NO FAULT CODES STORED. PERFORMED SYSTEM SELF TEST. NO DEFECTS NOTED.