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1 Z motor mount printed and mounted clutch 2 Enclosures for electronics 3 fan duct 4 Y-axis tensioner 5 Original Guide by linear guides find my results posted on this article replaced (perfect concentricity) 6 Dismantled original extruder and bulldog XL with J-Head mounted.
The board can be tested with the manual control system with Repetier software (manual control).
But since Extruder motor does not work via the normal connection, but via eg x-motor connection.
It looks like the stepper driver for Extruder on mainboard is faulty.
In this case I can refer you to our service ticket platform for request for spare mainboard, or RMA request for full check / repair. You can create a ticket here: https://customercare.velleman.eu/