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error at transmitter signal

Leitz PMM866

When moving in y-axis, it halts abruptly and this message appears:
"Error at Transmmitter Signal Y-Axis"

Tried shutting down completely and re-booting, but to no avail. Machin still faults out, but not always in the same location.

Any suggestions?????
Circuit Board?
Cable connector?
Bad Karma?

Thanks in advance!