Hustler 1500 Short Cut....no forward drive

Got a 1500 Short Cut....great mower, she likes driving it....using it a few weeks ago and just quit going forward by doing the normal rotation of the drive handles. I am thinking it is switch (which one?) or maybe one of the relays quit. There was no warning, just quit going forward. All linkage is still intact, no damage, and seems to move hydraulic actuators arms but no drive when rotating h-bar forward movement handles/grips. ID Plate says it is Model No. 925461 and Serial No. 8047867. Any help would be appreciated....I have not seen this problem in any forums, naturally.