I agree. Have to replace both the male and female on the 40 pin. I learned very early on from the Clay Harrel repair guides....
"if 95% of all intermittent problems are caused by connectors in general, then 95% of connector problems lie in the 40 pin inter-board connector which joins the driver and CPU boards together."
I replaced every 40 pin connector in every Williams System 3-7 I have owned.