SF is the series field relay.
Has nothing to do with my problem,which,again,has disappeared.
The first thing I look for in this situation with this type and vintage controller is the H contact being worn down and motor brushes.
Anything loop related or brake related is not the issue.
The issue seems to be stopping sequence.
And not FE remaining in causing a c-cy lock-up.
Just a car going through the terminal landings .
All the other landing stops are fine.
I hope it's ok now that I fixed the GO circuit.
Now,I only got the Armour TMS 900 going down every once in awhile and the TAC something or another going down also.
10 more years to go,sigh...........