Does water take the soap down , turn cold off and the valve will hum then if the soap goes down its working. I think you are reading too much into it , the only fault you had was a faulty valve now it's replaced it's working.
Just as way of an update; I decided to run with it, put it all back together & just use it. Surprise, surprise with washing placed in the machine, it filled both with cold & hot, so happy day all is well again.
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