As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ON TAKE OFF NOSE WHEEL DID NOT RETRACT CORRECTLY. FOLLOWING ECAM PROCEDURE WE RECYCLED THE LANDING GEAR. GEAR RETRACTED NORMALLY ON SECOND ATTEMPT. DECESION WAS MADE TO RETURN TO PHL. MAINTENANCE T/S PER TSM 32-31-00-810-842-A. FOUND PROX SENSOR 24GA TO BE FAULTY. REPLACED PROX SENSOR 24 GA IAW AMM 32-31-73.