But don't expect a quick answer, he was still at Shildon, when I left.If you PM Roughluck, he has just done this and I saw the pinout diagrams still in his boot. Not sure if his was MEMS3 though.
I have the RAVE manual which does have the wiring diagrams for the MEMS3, But I can't figure out how to extract the pages you would need, other than just hard copies!