Are Obama’s PDBs visible to DJT?
If they haven't been edited, and he knows where to look, then yes. It may have been that Rogers from the NSA warned Trump and told him where to look, which then caused the famous Trump tweet that started all of this. President Trump directly accused Obama of wiretapping him. Not the NSA, not the FBI. That accusation would make sense if President Trump saw the briefings intended for Obama.
I certainly don't know but my guess is they probably are, kind of like a reference file. Maybe it was Trump who discovered the files and saw the surveillance data first hand!
Yes they are.