Oil Pressure in oil pan (repeat leak)

[AllAroundTrucks]

Hi I had repeted oil pan craking and leaking, last week I had to change the power steering pump and now it's keep leaking from the oil power steering reservor and oil pan, the oil in the power steering is black so it's telling me engine oil pressure to high in the pan and it's goes true the power steering reservor due to hight pressure.

I'm wandering if there is and check valve or blow-by oil filter that may keep oil pressure inside the oil pan.

any help would be appreciated.

t800 2003 cummins isx 1