What was found
AFTER TAKEOFF FROM KMIA,WHEN THE MLG RETRACTED THE LT MLG DOOR SHOWED UNLOCKED ON FWD PANEL, OVERHEAD PNL,AND ECAM.WHILE GERAR HANDLE WAS IN THE UP POSITION THE AMBER DOOR LIGHT WAS ON AND THE RED GEAR UNLK LIGHT WAS ON.WHEN LDG GEAR HANDLE WAS MOVED TO NEUTRAL, THE MLG GREEN LIGHT ILLUMINATED. FOUND LT MLG SIDE BRACE ACTUATOR MOUNT PIN MISSING, GOUGE IN SIDE BRACE. BLENDED OUT DAMAGED AREA WITHIN LIMITS IAW E.A 6-3210-95470. INSTALLED ATTACH PIN, REPLACED SHEAR PIN, REINSTALLED GEAR DOWNLOCK IND. MECH. IAW A310 M/M32-61-14-4. R&R BRACE STRUT ACTUATOR.