Several months ago I had a paper jam. I carefully removed the backside cartridge on the printer and worked the paper out. I did have to pull the paper pretty hard and then slowly take out pieces with a needle nose pliers. It is possible I hurt the rollers in the printer. Yet still, if I'm printing one page double sided, the first page through (side two) runs fine, the second page through (side one) has the gap at the top.
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