[Billy-O]

If you have to ask, you'll never know. If you know, you need only ask.

You are pretty much on the right track to cleaning up the mess best you can and using baby powder to locate the source of leak. It may very well be the cork gasket but then it could be something else. When cleaning, pay attention to "wet" buildup of dirt and grass. Most of what I see in your pictures appears dry except on the bottom. Good Luck.