There is another post in the forum where they ask you to shut the machine off and remove the head and the ribbon cable going to the head to take a picture of the pins and post it. They do speak of the pin at the plug on the pro model. However, the other steps are applicable for troubleshooting. I am sure that they will be able to help you by you posting the issue here. It creates the ticket for them to get you some help.
              
              
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