If it was me I'd take it apart completly and clean any packing greases of the ways. set the nuts on the shafts and assemble one by one. Ajusting the gibs before the instalation of the nuts. also checking the the trust bushings/bearings preload.
you may also try posting the machine make in the title, maybe you can find a fellow user
If the machine is new check every nut bolts and things like the couplers and motor shaft flats and set screws.
And once you get it running again the first few times you run it make a test program and cut air for an hour or two. And then check your nuts by using a dial indicator and counting steps.
close up pictures would help. also try to determine the type of backlash nuts you have.
if it has hand wheels turn the wheel one way then revese it and notice how much it turns untill the axis reverses direction. that 'play' is what you need to get rid of.
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