Probably should have put this post first. My tractor has 500 hours on it and will not go into regen. My dealer is no longer is a LS dealer. He said it needs a burner injector kit and glow plug. I took the injectors out and verified they were working. The glow plug turns red immediately. I changed both fuel filters. there was a considerable amount of soot inside the burner. The DPF cycle times out due to ignition failure. Any ideas on what to check next.