electronic transmission problem to shifting gears

Hello I have a problem with my Mack dump truck 2010, mp8 engine with automatic transmission Eaton fuller RTS 169 10c-AS3. 270k miles.While working I was in second gear the truck went 10 feet and just stopped. The engine was working but I couldn't change gears, I use clutch everytime. I.I was pressing on clutch but couldn't change gears. I usually press clutch all the way to the floor and wait 2 seconds until the gears switch and show up on the dashboard screen. That day I turned off the engine and then I couldn't start it. The transmission was maybe left in the gear and the dashboard nothing shows. I went to the shop and received the following codes; code 60 FMI 7, main box shift neutralization system.Next, code 18 FMI 14, primary shift selection. next, Code 251 FMI 5, power supply current below normal or open circuit. The truck is in the shop for a week and noone knows whats going on. If anyone has any suggestions please reply I really need it Thanks