I was given a miller xmt 304 welder that had an error code of he.lp-8. I called miller and they said it could be the HUD, Display board or Control board. I could not find any information about testing these items to figure out which ones they are. I am wonder if anybody has a photo of these items and a way to trouble shoot them without paying an arm and a leg for parts and service. I checked the owners manual but it said send to a technician. Any help would be great.