I have vertical lines on my DMG and have tried applying pressure to fix them even going so far as to apply a low heat soldering iron to the ribbon to no avail. I've been able to see little black marks approx. in scale with the missing lines, could these be impurities on the ribbon?
Also I cannot get all the pixel lines to fade/discolour as I have seen people do in most of the guides. Am I simply not applying enough pressure?