As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF KMEM 18R. GEAR WOULD NOT RETRACT. HANDLE CAME UP. BUT AFTER DELAY ECAM DISPLAY OF GEAR WOULD NOT RETRACT. FOLLOWED ECAM AND QRH. RETURNED TO KMEM 18C. LANDING UNEVENTFUL REPLACED 64GB PROX SENSOR REF AMM 32-00-00-04. OPS CHECK GOOD. PERFORMED NORMAL GEAR EXTENSION AND RETRACTIONTEST IAW AMM 32-31-00-05, OPS CHECK GOOD. PERFORMED PSEU OPS TEST REF AMM 32-31-71-04, OPS CHECK GOOD.