Dpf is coolant soaked

[adams70]

Ok im about to say I had enough of this isx15 2350. I got a soot level high and I just regenerated Saturday morning. I took the dpf filter off it was pink on the backside of the dpf filter. Where should I start checking for leaks? It’s a 2015 and I have never done a egr cooler on this truck. It’s like all off a sudden all these maintenance issues. Im about to remove the egr cooler first time wish me luck. How do u tell if it’s bad? How much they run? Thanks for the help and insite.