The area he's describing is a right angle gear reduction box that hangs off the side of the crankcase to turn the driveshaft out the back (and drop down the front driveshaft if this is a 4x4 model).
Even overheating the hell out of the engine shouldn't turn that gasket...
if she was ran hard put away muddy then ran hard again after months of sitting it would mess the seal up pretty good allowing fine dirt or dust to work its way in..it happens...keep in mind inches above where you are talking about is a breather hose that is known to leak profusely once the engine gets a lil hotI:I