What was found
ON FINAL APPROACH, L/G WAS EXTENDED ECAM -LGCIU1 FAULT- ILLUMINATED. DECIDED TO GO AROUND AND ATTEMPTED TO RESOLVE ISSUE. RETRACTED L/G LGCIU FAULT AND LGCIU 2 FAULT ILLUMINATED. APPLIED ECAM ACTION OF GPNS, OFF AND MANUAL GEAR EXTENSION. LANDING AND TAXI WAS MADE W/O FURTHER INCIDENT. PERFORMED TSM 32-31-00-810-807- LGCIU 1 FAULT 40GA L/G SEL VALVE. REMOVED AND REPLACED 40 GA IAW AMM 32-31-12-04. REMOVED AND REPLACED LGCIU 1 & 2 AS PRECAUTIONARY MEASURE PERFORMED BITE TEST OF BOTH LGCIU'S IAW 32-69-00. TEST OK. PERFORMED (2) ADDITIONAL RETRACTS OF L/G SYS, NO FAULTS NOTED. TSIN 536T07165 ACCOMPLISHED IAW TSM 32-31-00-810-802. OPS NORMAL. A/C OK FOR SERVICE.