Epson Perfection 1640SU Flatbed Scanner "scanned picture faint" Questions

...faint yellow line while scanning 1. Warrantys over and it no longer in print...Its driving me nuts, I tried to open it clean lamp on top area.. 3 TIMES ALREADY.. that the yellow line is Showing in ...

...faint shadow you can make out as the actual picture, is red! I did everything I could think of. Even went into the HP problem solve. I checked all plug in connectors. OK I tried the one to shut down ...

...picture. But when I scan it appears to have ignored all the settings and the pdf file looks the same whatever I have done, i.e. very faint and indistinct. Based on what Geoff Duke has suggested, i ...