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      02-28-2012, 01:30 PM   #4
onebadmofo
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Drives: 2007 E92 335i
Join Date: Aug 2010
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Honestly no clue, check all the connections I guess.
There's also MULF2 and TCU units under carpet. They are irrelevant to sound but the optical connection passes through them, so if one of them is dead then there might be no sound.