What was found
(CAN) WHILE DOING AN ALTERNATE RELEASE CABLE CHECK, THE RIGHT MAIN LANDING GEAR ALTERNATE RELEASE CABLE CAME DISCONNECTED AT FORWARD END OF TURNBUCKLE. ONE OF THE TURNBUCKLE ASSEMBLY 'SAFETY PINS' WAS MISSING AND THE SECOND ONE WAS NOT STOPPING THE TURNBUCKLE FROM MOVING. WHEN THE ALTERNATE RELEASE SYSTEM WAS CHECKED THE TERMINAL END PULLED OUT OF THE TURNBUCKLE. ONLY 3 THREADS HAD BEEN IN THE TURNBUCKLE.