Powershift Trans service

Quick question for you guys..... looking to do a Trans service on my 2000 case 580 super l. I have a powershift Trans in it. I called 3 dealers on fluid recommendations and I got 3 answers. I was told to use case hydrodex 3 by 1 dealer, hytrans ultra by another and penzoil atf by the third.... anyone know what I should really be running in it. I called the previous owner and he had no idea.

Thanks
Craig

Powershift Trans service