I am in the Ayleid Ruins where there are stairs that need to be activated remotely, but I can't find anything so am stuck.

I can see through the floor (this can't be right) that there are some buttons, but also a missing nif - something like AAFQARFloorRaisedSecretcomplete01.nif

Any ideas as to how I can make any progress or fix the missing nif?

As always, any help will be very much appreciated.