title: Excel - lines running through spreadsheet
body: <p>Excel running on a MacBook Pro.</p>
  <p>I have one spreadsheet which is displaying three diagonal lines from approximately A11 to L65 - L72. I have never created these lines and although when I scroll below row 72 and return to the top of the sheet they are removed from the display they then reappear.  They are causing me problems as I cannot print the spreadsheet either to printer or PDF without them appearing.
  <a href="https://i.stack.imgur.com/gezpa.jpg" rel="nofollow noreferrer">Excel spreadsheet</a></p>