Folks, I had my new extruder for a week or so, and managed to get filament stuck in the cold end. It was woodfill and the print failed (failed to extrude). When I tried to move the filament in either direction, It was frozen. Talking to support, they suggested jamming the cooling fan so that the transition would heat up a bit, loosening the filament and allowing it to move. That didn’t work in my case.
It was also suggested that in general, when removing filament in a controlled situation, to extrude a couple of cm of material before rolling it out.
Honestly, I’ve had my Taz for a few years now, and I never got into a situation, other than the nozzle getting gummed up, where I couldn’t resolve a jam. This new unit is a bear.