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did the problem just start? after some recent work in the boot/trunk? or, you had this problem all the times? the sound that you are describing, reminds me of defective CD...
you mentioned that you have two more E53s. do they have normally functioning CD changers? easiest test is to swap the changer with a known good one and see if the problem stays or goes. swapping a changer is an easy procedure, if you are good with a wrench...
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