As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED A GEAR DISAGREE WARNING. CREW ELECTED TO RETURN TO PHL. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND FOUND A HYDRAULIC LEAK AROUND THE NLG AREA AND FOUND A BAD PROXIMITY SENSOR ELECTRONIC UNIT (PSEU). REPAIRS WERE MADE AND PSEU WAS REMOVED AND REPLACED. CHECKS WERE PERFORMED. NO FURTHER DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE.