We have an Edge FX that has developed a thin (less than 1mm) horizontal white line in all colors, always in the same place (1/2" from front edge). Increasing to high heat seems to help with some colors, but not with others. i seem to recall having this issue with an Edge 2 in the past and determining it was a bad print head. I have cleaned it thoroughly and rebooted everything to be sure it isn't a software issue, but it is still there. Any advice on where to go from here and who to call would be appreciated. Thanks in advance for the help!