MFP M525 has one edge of the document extremely faded when making copies or sending electronically

Toner cartridge was recently replaced. Printing to the device via Windows is fine. The fading only happens on one edge of the document when making copies, faxes or Emailing a PDF. Paper is fed landscape (wide edge first) and the front edge is the one that is faded. Approximately 1/2 inch in until the full normal darkness returns. This has happened on multiple devices. The entire scanner bed was replaced on one of the failing devices which appeared to resolve the problem temporarily but within less than 100 scans the problem returned.