the problem is back (asking for backup, machines goes to end of the tracks, no boom coming down, but no error on the display except for error68) , so far changed measurement eyes and can eyes. I'm now going to clean (open its connection, add dielectric grease) Contouring eyes and see if its fixed. I dont have spare eyes anymore until next Monday. I did use used eyes I took from Measurement eyes for the can eyes.
The fact that I got error 68 means the boom wanted to come down but didnt due to being at the home position, so it cant be the boom eyes. to your point below, I think it is the countering eyes.
" if the boom comes down at the front and/ or back but goes all the way back home into the nest before the machine travels that is likely a profiling eye problem. "