DPF Fuel Injector1 No Response msg on dash

[Sasquatch]

Hello, I have a 2009 Pete 387 with isx cumming, and I have the above mentioned error msg on the dash, as well as a loud rush of air sound on the passenger side of engine that seems to be coming from the section of exhaust that the doser injector mounts through. I had noticed a bit of puffs of white exhaust as I would come off the highway and slow down, and also when doing a parked Regen. They were coming from the two ends of this section of pipe, just every once and a while. Now I have had to idle for a couple days due to apu problems, and this has developed, I feel very hot air rushing out of these leak spots, and need help diagnosing this please. Thank you for any ideas.