We have rebuilt clamp cylinders, replaced prox. switches and swapped FUB cards. The mill still periodically stops at sequence 10 of a tool change?
Just went thru an issue on my old Co's MX
Always check the messages on the "Diagnostics" page
-if it us an unclamp LS signal
-----problem is the limit switch adjustments on the back of the spindle
( these can be fiddly to set )