Diff leaks oil - what can do?

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fun-24-7

Pack Dog
Joined
Mar 18, 2012
Messages
102
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Bike
BMW R1200GS Adventure
By change I saw a patch of oil lying next to the rear wheel of my 1200 GSA this afternoon. On closer inspection it seems to be leaking out from the flange on the diff where the spacers are installed - that will be the big flange on the far right looking to the front of the bike, hope you guys know what I mean. This is a new development as I know for a fact it was not leaking over the weekend, as I would have noticed, but it is clear from the oil marks on the rim that this started while I was riding today or yesterday.
Any idea what the problem can be and what can be done to fix it?
2006 model with 86 000 km on the clock. never had any diff problems before....
 
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