It is apparently undergoing (maybe completed) at the National Air and Space Museum in Washington. The NASM website shows that it was undergoing restoration at the Paul Garber restoration facility. I believe that that restoration facility has moved to the Steven F. Udvar Hazy located at the Dulles International Airport in Washington. It was not on display during my last visit about a year ago. I have a friend that works there, so I will try to find out further information. There are links under the N number on the “Aircraft” page that will take you to some of the articles.