Doosan Puma 3100Ly Axis x/y moved out of reference point

So i had a little bit of crash on work and the revolver is now out of reference point, it's still operatable and you can easily work on as nothing happened, but i know there are some ways to return revolver in original state(reference points) through some mechanical work.

Know i want to know if there is anyone here with some actual informations how to do this( i know it's not so hard but still i don't want to start without some instructions how to do this), Doosan machines are similar and pretty much basic CNC turning machine.

So a guy is in need of some instructions and help.

Thanks once more