These 2 models (almost identical, of course) are both jamming when duplexing. They seem to do fine on single-sided. I have replaced the turnover units (paper-reversing unit, whatever it's called) in both of these, and cleaned every grey feed roller in the paper path. Does not seem to be a finisher issue, does not seem to be a fuser issue. Ideas? Thanks. I was thinking maybe it's the little gate/spring on the end door, someone also told me they think that whole end door unit can also warp from heat.
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