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Do you have a part # for that 'circuit' (i.e. circuit board, perhaps?) ? that would help immensely with either you, or I, finding a source for it.
Have you contacted this site/co.?:
A parts inquiry there could, at least, yield the part # of whatever it is precisely that you need.
(And again: if you can give me a part #, I can tell you where to obtain it, more than likely if not quite certainly.)
(Can you find the part you need and its #, on this page:
and is it perhaps the circuit block, part # 4001 036 ? )