The document I was thinking of referred to fuser wrap jams. I did some quick checking of duplex jams though and this might give you some guidance to check for.
These errors refer to jams when repicking to print side 2.
Cause
Solution
The spring of the duplexing media-repickup-sensor lever is unhooked
Check the spring and place it in the correct position.
The duplexing media-repickup-sensor lever is damaged
Replace the duplexing feed unit.
Poor contact of the duplexing media-repickup-sensor connector
Reconnect the connectors of the duplexing media-repickup sensor (J1945), intermediate (J1909, J1950) and the DC controller PCA (J4105).
The duplexing media-repickup sensor is defective
Check the duplexing media-repickup sensor by the sensor monitor mode. If the sensor is defective, replace the duplexing feed unit.
Poor contact of the duplexing repickup-motor connector
Reconnect the connectors of the duplexing repickup motor (J1771), intermediate (J1908, J1939, J1941) and the duplexing driver PCA (J4104).
The duplexing repickup motor is defective
Replace the duplexing feed unit.
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I remember reading something about this but HP's site is down right now and I cannot access the tech documents that apply for this printer. Will post later once I have access again.
OK thanks, problem is still outstanding I await your reply
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