I have received and installed the new servo (Evil Mad Scientists have GREAT customer service!) but I get the same symptoms.
Using the axidraw extensions in Inkscape, I try to use setup to do the pen up/pen down test.
The pen up test works to move the pen up then the pen lift servo stops moving. No up, no down, no motion.
I can manually move the servo to the down position and it will lift again, just once, then nothing.
Seems to me like this is more likely a EBB control board problem rather than a servo problem.
Can you post a link to order a new circuit board?
If my Axidraw V3 is compatible with the new EBB control board I would prefer to use that. Otherwise I will just replace the existing board.
Thanks for all your time and effort!