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Cant claim to be a Ducati expert but have a load of bike years behind me and 99.9% certain that there is a gasket there . What may have happened is that someone in a past life has had the casing off and what can happen is the gasket stretches or tears, a common sort is a smear of gasket compound for a quick fix, this MAY be the problem with yours Tom. Only real fix is to take off the offending casing and check and replace. Just make sure you note the position of the bolts as they are different lengths. Take your time and youll be fine , ideal opportunity for an oil change as well. lots of people on here to help to.
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