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I've just come across a short Video that I made some time ago about Testing the Valves in the Valve Block of the Teves Mk111 ABS Master Cylinder Actuator, that I thought might be useful in your situation
The following Photo will show you what is inside the Valve Block including those 'Ribbon Connectors' together with the Video that shows you how to Test it
Just a word of Caution: If you turned that Valve Block upside down then its highly likely that some of those Valves would fall out, where the weight of these alone could be more than enough to break those very fragile 'Ribbon Connectors'
What's inside the Valve Block of the Teves Mk111 Master Cylinder Actuator