Aha Leendert, thanks for getting back with the correct name.
Now I found it. It was a sort of expanded repair unit.
I wonder what the Canadians did to it since it warranted some kind of repair?
Perhaps nothing at all! Somehow it sounds like a "gremlin" aircraft. The Canadians just wanted to get rid of it, the 84th GSU then crash it on a test flight.
Speculation no doubt on my part....but....
Cheers
Stig