What was found
CLT - FLT 9225 PHL TO CLT. WHEN THE LANDING GEAR WAS LOWERED, THE CREW RECEIVED A "L/G SYS DISAGREE" ECAM WARNING. THE FLIGHT DID A GO-AROUND. ON THE SECOND APPROACH, THE LANDING GEAR EXTENDED NORMALLY, WITH NO ECAM WARNINGS. THE FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REMOVED AND REPLACED HARNESS 1M AND 2M. ALSO, THE NLG STRUT WAS SERVICED. THE SYSTEM WAS OPERATIONALLY AND LEAK CHECKED OK.