I've had my light come on solid a couple of times before. Once it gets that bad, you have to really run the beee-geeezusss out of it to get it to clear out.
10 minutes will not do it.
Just free revving the engine won't do it either.
You have to put the engine under load AND max rev's at the same time. In the summer time I can do this by running my brush hog out in the pasture. In the winter time, the only load I can put on it is by roading the tractor down the road. I put it in high gear and run it flat out down about a 1.5 mile long dirt road. If the light on my dash is only just starting to blink, then usually ONE trip down the road and back is enough. But if the light has come on full steady solid, then it takes 2 or 3 trips down and back this same road, without pausing between "laps", to get it cleared out again.
There's no more doubt for me that my DPF is coming off. I don't want to hassle with it this winter. My only hold up is finding the exhaust shop to do it. I'd like to find one that would do the whole thing for me, drop it off and pick it up when it's done, but I'm not sure I could find a shop locally that I'd feel comfortable to do it. The welding shop I've worked with on other things doesn't really want to do it. So I'll probably just pull it off myself and take it to an exhaust shop, along with a new tractor muffler from TSC or similar.