I Looks like you have ordinary steppermotors and some limit switches.
It is not the cheapest way but it is probably the fastest way for you to get it on the run again.
Take a look at: Geckodrive G540
G540 4-Axis Motor Control
I am using it in our Plasmacutter, inside the G540 there are four G250 and im using them in my Foamcutter and in my small cncmill.