What was found
BEFORE LANDING CHECK, WE HAD A LG EXTEND UNSAFE INDICATED BY THREE GREEN LIGHTS & ONE RED UNLOCKED LIGHT ALL ILLUMINATED. WE PERFORMED THE EMER PROCEDURE & CYCLED THE HANDLE SEVERAL TIMES. WITH THE UNLOCKED LIGHT REMAINING ILLUMINATED, WE RETURNED TO BASE & HOVERED TO ALLOW THE MECHANIC TO ENSURE THE GEAR WAS DOWN & ALLOW HIM TO PIN THEM IN PLACE. AFTER THE GEAR WAS PINNED, WE LANDED WITH NO FURTHER INCIDENT.