Doosan DX300 Engine Help!!

Hi, posting this to help a man out. He has a Doosan DX300 Scania engine 2017 The digger runs for 30 mins, then loses power and shuts off completely! He has had Doosan and Scania out working at it and nobody can get to the bottom of it, they have replaced turbo and actuator still no better. I don’t know what fault codes it is showing but nobody can figure it out! Any help would be greatly appreciated!! Thanks