Nuggy and I have just about finished bringing a Secret Service back
from the dead. Looking for the 50 volt flipper power board used in
Williams system 11 games up to Fire!
http://www.pinrepair.com/sys11/sys9b.jpg

Or as used in DE Secret Service and Laser Wars
http://www.pinrepair.com/de/laserwar8.jpg

Either one, they are identical.

These links were not working, maybe the site is tempor down.  What do these boards look like?  Is it the small board with the fuse and rectifer? If so I may have a spare for sale.  Let me know