Hello all!!! I have a 2011 Deere 650j dozer. The other day the batteries were dead so i replaced them both. Our trucker driver went to load it and got in on the trailer fine! Then when he went to put the blade down the blade would not move down. Machine runs fine forward and backward. Unhooked the batteries to reset and it is the same. There are two codes 2712.1 and 3157.4 any help would be great! Thank you