Zeroing (C3) prox problems

Good morning all. I need a little help I have an '07 PRS standard that I purchased in April the machine has been trouble free until this week. I can not run my C3 zeroing routing as the contorller thinks the prox swtiches are hit. The comment box reads "use arrow keys to move off of prox switch (ESC when clear). I move the table and head with manual controls and the error does not go away. I've check the proxes with a steel ruler and the lights go on and off. I've traced the wires and they are in place. The Inputs on the control screen are green. And I tried changing the VN settings to see if that's the fix but no change. I running out of Idea's any suggestions would be greatly apreciated.

New Shopbotter...
Richard Ford