interesting thead, want to see pics of this CNC stuff.
Mine failed around 10 years/140K miles I believe. Started to make that whining/whistling noise, unplugging it made it stop. I fully investigated it and the flap was fine and pin as well, there was something wrong internally with the vacuum mechanism. So I bought a new one. The way parts go in this beast, I'll take 10 years of worry free for a part any day of the week!