I am very familiar with what you mention. I have a 100 series and the accumulator has a faint buzzing sound as well (inaudible from inside the car). In my 200 the noise is not faint, I can hear it from inside the car and it happens even if I just depress the brakes without having the car in motion. It looks like certain 200 have the problem others don't. For a company of the quality and prestige as Toyota, this should be unacceptable. Quality and Kaizen should be their number one concern. We should not accept this as being normal, we are not helping them (and us) and for an iconic brand such as Land cruiser totally unacceptable. Thank you for listening