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You'll want to replace the duplex switchback roller (302FB19401). When it wears the roller wears conical.
When it's new it's 66mm circumference. As it wears, the rear wears faster than the front. When the difference becomes 1.3mm (65.3mm at front, 64mm at rear) the paper skews so badly that when inverting for exit or duplex, the rear edge flips, causing J60, J62, J63 jams. When stapling, the flipped corner prevents the paper from setting in the stapling tray properly. =^..^=
If you'd like a serious answer to your request:
1) demonstrate that you've read the manual
2) demonstrate that you made some attempt to fix it.
3) if you're going to ask about jams include the jam code.
4) if you're going to ask about an error code include the error code.
5) You are the person onsite. Only you can make observations.
Also, check the plastic roller above the switchback roller. Dirt, toner and other stuff can get in the shaft area and cause the roller not to roll good. I usually pull the roller off, clean the metal shaft and where it fits on the roller.
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