Gildermeister CTX 400 retrofit

Hi folks , I have a Gildermeister CTX 400 in need of new electronics , ie , main boards etc .As the Heidenhain platine / boards ,on mine are defect and new parts are not avaliable .Ansd not repairable Ive been told  Could someone suggest where what I will need and where to get it all and maybe some tips would be great .        Im in Germany .Hope to hear soon   Harry 

Do you have the schematics for it?
Take some pictures of the inside of control cabinet and post them here on the forum so we can have a look.