Platte River Network (PRN) is the company that has been managing Clinton’s private server since June 2013. In November 2015, Politico will report that the FBI interviewed some PRN employees in September 2015. This will be confirmed by PRN spokesperson Andy Boian. The same month, PRN turns down a request for the Senate Homeland Security Committee to interview five of its employees.
It isn’t known how many employees are interviewed by the FBI or who they are. The FBI Clinton email investigation’s final report released in September 2016 will make no mention of any PRN interviews in 2015 at all (though there could be mentions that are redacted).
However, it will later be revealed that PRN only had two employees doing the work on the Clinton server, and one of them was Paul Combetta, so it seems likely he would be interviewed. But the FBI report will say that Combetta was only interviewed twice, both times in 2016. It will later be revealed that Combetta was the person who deleted and then wiped all of Clinton’s emails from her server. (Politico, 11/13/2015)