Physically re-seat means just pull out controller from the Controller slot and then again put back in the same slot. Please find the Controller replacement instruction and this may help you to get idea of how to physically re-seat controller,
https://support.hpe.com/hpsc/doc/public/display?docId=emr_na-c03793459&docLocale=en_US
Hope this helps!
Regards
Subhajit
I am an HPE employee
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