I have an Epson WF-3520 printer. Really like Epson printers, but this one did suddenly print vertical black line. Checked by scanning the same page, and I did not expect to find the same verical line on the scanned image. But it was there, no doubt. Did only one print head cleaning with no change. \nDid clean small and big scanner glass with mild detergent. No change.\n\nI am not sure why I get same vertical line also when scanning. Thought that was only a printing problem.\n\nAny ideas how to remedy the problem?