Last Tuesday we pulled the chassis and verified everything worked. This wee we pulled the chassis and verified everything worked.  Finally while watching the binary switches we were able to trace it down to a pin in the cable pulling out of its socket.  This was very troublesome because it would work as long as we had a breakout board inserted in between the cable and the chassis.  Watching the signals while re-assembly took place we per able to narrow it down and found the problem.  We have removed the back-shell of the connector and shoved the pin back in place.  Next Tuesday we will crimp on a new pin.  So we have not closed the work permit yet.