Bridgeport BOSS 6 Spindle Problem

The spindle on my BOSS 6 went out and won't start. I have traced the
problem back through CR3 and the SCA board to signal #203 which leads
to a terminal block in the control cabinet. It looks like it goes to
the ZDI board, but I can't measure continuity to any of the pins and
I loose visual on the wire in a big bundle. Anyone have a BOSS 6
schematic that shows where signal #203 goes?

~petev