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All - photos below of a bad brake actuator. As i've read, not serviceable as far as I can tell. Perhaps the tiny black/white O-rings in the little circuit board sub assembly. But you have to clip some wires on disassembly - which could likely be soldered back together. Perhaps the seals that are down in the block of the device - not sure, because i haven't been able to remove anyone of them (Yet). The series of 8 small and 2 large circular details at the top of the assembly are electromagnet actuators that drive the rods (assume attached valves). All in all, interesting assembly. Last pic is the comparison with the new part - look the same.
BTW, the number on the part is not the part number (i confirmed with Bell Lexus that i bought the part from). The part number on the box is supposedly the actual number. He verified by opening up a few more boxes. So hopefully i have the new, upgraded version in the car.