2008 Komatsu D31px21 Dozer with 2400 hours

All, I am hoping someone here may have a little Komatsu Experience. I am currently digging a 2 acres pond on my place using my dozer. I was backing up at a rather slow speed and went to shift it from reverse to forward and when the shifter was about in the he neutral position I lost all power to the hydro tranny. Meaning when I move the shifter in forward or reverse I have nothing. I cant get it to move. It threw alarm codes DK31KB (steering angle sensor 2 : short circuit HST) , DK56KB...

2008 Komatsu D31px21 Dozer with 2400 hours

2008 Komatsu D31px21 Dozer with 2400 hours