Had the output shaft replaced back in May, about 8000 miles ago. Oil seapage just started from under the rubber boot where the drive shaft enters the engine. No sign of oil on starter motor yet; or, God forbid, rear wheel. A couple drops of oil on floor but stops with engine off. Seapage runs from under boot to rear leftside bolt hole under motor and drips from there. Thinking a seal must have gone bad - any ideas or experience with anything like this?