I hope it isn't anything other than some idiosyncrasy ...... Guzzis have a few of these. My 2008 1200 Sport turned 66,300 miles toward the end of this riding season, and so far, only a few issues, the biggest being the failure of the LCD panel in the dashboard. No mechanical issues to date, unless one would worry over final drive 'weeping' at the joint between the swingarm and final drive unit. I'm used to that kind of stuff, having owned a 1991 BMW R100GS that weeps but doesn't drip. Rather than worry, I clean it up a couple of times a year.
Bob