Hi Barrie,
at least you can find a crew list for U-407 on this webpage:
http://www.ubootwaffe.net/index.html
Perhaps itīs also a good idea to contact the Submariners Association Kiel e.V.:
http://www.ubootkameradschaft-kiel.d...rame-index.htm
I can imagine that they may have informations about surviving crew members.
Good luck on your search!
Michael