Kenwood FP520 replacement motor has different wiring?

Hi Folks,
my Kenwood FP520 motor burned out after the liquidiser bearing locked up >:-( .
I now have a replacement motor assembly, which is identical to the original EXCEPT that it has 6 wires running from it (2 groups of 3) instead of the 5 (2 + 3) of the old motor. Plus a couple of the wires are different colours...
Can't find a wiring diagram anywhere. Does anyone know if Kenwood changed the wiring logic midway through production, or what to do with the extra (yellow) wire?
Many thanks
John M.