I'm in U.S. I think my printer is in the first batch shipping from the U.S. distributor last year.
The hot air gun did the trick - came off just like peeling a pile of old gum off something. I got almost everything, but there's still a little residue left in a few places. Printing great afterwards, but I think I shortened the PTFE coupler life (unfortunate since I just replaced it).
As great as it is getting quality time with my hot end, this is not something I'd like to repeat Do you know the name of the tiny white ring, or where I could order it?