Repair service for the AMX 4/4+ This service for the AMX 4/4+ is EXCLUSIVELY for our customers who have purchased the repair option on a certain circuit board or part that needs reparation. Here are some steps to get the repair service. Find a part that you need the repair service for. Select the “Repair Service” for the part and fill out the form. If you get this message, then we have gotten your message and we will try to get in touch with you as fast as possible.