Have a servo -007 alarm

Power leaves the slave board tbop1 comes through the slave cable and to the distribution block. Leave Blick goes to ab contactor . There is supply out on A1 on the contactor. There is a line 618 it comes from the push button on operators station .when you push it in it does not transfer power back to the contactor and supply it to the logic box. What is holding this up????. Need help. The robot has been mastered thank you