What was found
GEAR DISAGREE ON FINAL APPROACH. LEFT MAIN LANDING GEAR DID NOT INDICATE DOWN, AUDIBLE CLUNK WAS HEARD WHEN LEFT MAIN LANDING GEAR DID FINALLY INDICATE DOWN. COMPLIED WITH QRH AND LANDED WITH NO FURTHER ISSUE. (FLT#3912) REMOVED AND REPLACED LT SIDESTAY MLG ACTUATOR ASSY IAW AMM. PERFORMED LEAK CHECK OF LT MLG SIDESTAY ACTUATOR IAW AMM. LEAK CHECK GOOD AT THIS TIME. PERFORMED MULTIPLE EXTENSIONS/RETRACTIONS IAW AMM. OPS CHECK GOOD.