Anyone have one of the new Macks 272xxx? The ones that take the DEF fluid. Beautiful tractors, great drives, but here's what happened to me last night: Pull into a facility and dump my trailer.The little screen lights up and says "DPF full. Please park and REGEN by pushing REGEN button". OK, brand new tractor, I decide I should do what it says before I drive it and it breaks. Park, push the button, idle jumps up to 1200. As I'm waiting, I'm reading the info on the visor. DPF is Deisel Particulate Filter, Idle is supposed to jump up when you do this, yada yada yada... Half an hour later, I'm still waiting..... I assume the idle will go back to normal when it's done?? Anyhow, after half an hour I had had enough. Let go my brakes (idle goes back to normal) and I headed home. No more warnings that trip. So my question is, How do you know when that thing is done?