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Yeah I get this every now and then - it's VERY intermittent, and haven't heard it for a while. Like you described, turning off stereo/climate has no effect.
The link above is showing the small cooling fan for the DME, which is in the back corner of the engine bay (different sides according to RHD/LHD). I've had mine apart many times, so can do it pretty quickly, and will attack it next time the sound comes back, to confirm the source.
There's a how-to photo guide post over on N54 in the S63 JB4 thread.
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