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Was thinking this was indicative of valve cover gasket leak. Two photos are of left side and one photo of right side without suspected leak. Is it fairly easy to replace valve cover gasket?
Having said that, it's likely a valve cover leak, which the dealer will want a lot of money to fix. But you have to ask yourself, what damage will this do? How bad is it leaking? It is just as easy to clean it every now and then with some engine cleaner and compressed air?