SR840 jam25

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I have an sr840 on a 2105 which has jam 25 on the second stapled set of a job run, first set exits ok and then jams on the second set with Jam25 shown. I seem to remember something about this but cannot remember what causes it, any ideas ?

[Fearless V K]

Found these solutions on Ricoh global knowledgebase for jam location SP 7-504-25
BCU defective
finisher main control board
replace punch unit
Pre stack gate solenoid
replace fusing/duplex motor
finisher entrance sensor

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Thanks,

looks like it was a slow soleniod allowing the first sheet of the second set to be misfed.