Bought a second nozzle kit,and installed it.
Wanted to test, but extruder motor does not run.
Tried switching the stepper driver with X axis. And it runs.
Stepper driver second extruder DOA.
How do a get a replace item.
Double check the orientation of the driver board for the second extruder. It faces the opposite way around to all the rest of the drivers! See this pic:
I would guess it would release the magic smoke if inserted the wrong way around!
I know how it has to be oriented, otherwise my second driver would be dead too, don’t you think 
Other driver doesn’t simply do the job.
think they call that DOA
regards, and thanks for the advise