Just picked up some used 2020(supposedly) 250-5 doosans, some obvious issues and some need some help. Both throw scr warning when keys turned on and a CEL. Need to figure out how to read the codes and go from there. One has a obvious steering issue, steers very stiff and hydrolic pressure when turning the wheel at idle is around 1200psi while the other loader steers fine and will have over 2000psi. Any idea what's going on with the steering?