Miele Cat & Dog 326i Bagged Canister Vacuum "speed fan switch red blue" Questions

...speed fan, four wires, but it's NOT the first switch I mentioned). In most cases I would first try the replacement mentioned above. These are the switches that your local hardware store should ...

fan assembly has a semiconductor switch (SCR?). There is a 5-pin connector that has WH/BK = AC; RED/RED that seem not to go anywhere; and a GY. The mating connector has only the WH/BK (AC) wires (only