I suggest you re-read his posts,,,
"I put a piece of blank paper on the 105's glass and copied it, getting the streaks across the top of the page, I also printed from the PC to the 105 getting the same result."
Try swapping the entire blade unit, so you get the LED string as well as a different blade holder so you can rule that out. Make sure the mylar that rides on the drum as D_L_P mentioned is clean. I know how frustrating this is...
I can also as the last poster stated,, free my mind from the plausible explanations and go with my imagination, and suggest that he replace the rear cover of the copier as something to eliminate from all the possible subjects.
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