My Mutoh Valuejet has recently been printing a small 1/8 inch magenta line after dark colors. We have recently changed our printhead, maintenance station, wiper and we do weekly cleanings. I have tried adjusting my ICC profiles (using FlexiSIGN-pro) and output color levels. The line is only printed at the top every time a dark color is printed and not on any other side. Attached are some pictures for a better description. Any suggestions/advice is greatly appreciated!!!