CrankCase Pressure SPN 101 FMI 15 FC 1974

[Hermjeji]

***UPDATE***

Someone told me that I may be losing pressure in the system somewhere. I cut a bottle in half, clamped it onto the DEF tank cap, cut a hole through the top of the lid and pressurized it with some air.

The codes all disappeared, the truck regened, and it's running fine...

any conclusions from this?