Long nose pliers + wads of toilet paper made quick diagnosis of where it was leaking from. With pliers, I pushed in the return lines on #4 and 5 all the way with a hot engine and they seated all the way to bottom. Also loosened /retightened #4 and 5 injector nuts till the leak stopped. It's bone dry now.
I hate leaks! it seems by replacing the oil filler cap with a metal one (was plastic) and smearing a thin layer of epoxy on the breather nipple stopped both from leaking. Previously, I tried sanding smooth the nipple but it still leaked because of casting imperfections. Mercedes did not machine the nipple from the casting and that's the reason it leaks. If you look closely at it you will see.
