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Just replaced my tensioner assembly, and the symptoms match your description pretty well.
The tensioner/idler assembly is well known to fail at roughly 70,000 miles, and your 104,000 KM's is ~65K miles- swap it out along with a new belt. Inspect your other pulleys to be sure they're in good shape.
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1and1
135i - E82.N54 2009 BSM - MHD / xHP / DCI, PR CP & 7.5" Race IC / N55 mid & Borla
. . WL RSFI, Koni, Eibach & Dinan CP's, M3 CA's / EBC Red's & Firehawk 500's
X1 - E84.N20 2013 MGM - JB4 - The Wife's, now with new turbo & ewg
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