It seems my original post did not make it through a while back so I am re-posting:
We put up not too long ago a DIY
manual on our site:
https://b3innovations.com/wp-content/uploads/2015/03/Pico-User-Manual_Rev2_DIY1.pdf
Starting on page 9 is helpful material on installing the heater. To first
uninstall, read the thermistor section on how to separate the wires and
then after you must remove the nozzle. The heater will then slide out the
bottom, may require to be broken free first by pushing the heater upwards
then down with a pin or Allen key.
I hope that helps and let us know if you have any questions.
Mike
The B3 Team