I have an open ticket with Sovol already, they sent me new parts (nozzle adapter board and nozzle board communication cable) which I have replaced, but my issue persists.
Receiving the following error on the screen: !! mcu ‘extra_mcu’: Unable to connect
Within mainsail I get:
Klipper reports: ERROR
mcu ‘extra_mcu’: Unable to connect
Once the underlying issue is corrected, use the
“FIRMWARE_RESTART” command to reset the firmware, reload the
config, and restart the host software.
Error configuring printer
Has anyone else encountered this situation and replaced the parts recommended by sovol and then still had the persistent issue? Any tips or tricks to solve? Any experience I might be able to use to temper my expectations 
Thanks,