Kind of hard to tell from the pics but I's say the generator cover is leaking,,,, maybe at one of those bottom bolts. I'd clean it up and re-torque all the bolts on the cover and see what happens.
Sometimes a gasket shrinks or a fastener comes a bit loose with time. Try tightening ( gently ) If that does not work replace the gasket .
Again, its hard to tell from pics but this is my best guess.