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by "underneath" do you mean you had the injector out of the hole and it fell into the cylinder or did it fall between the rocker arms and springs?
Not sure what rocker arms and springs are, but its right next to the big square gold thing (I believe that to be a fuel injector). I can't see it anymore, so I'm not positive where it ended up.
Do you have some compressed air? You could try gently blowing it into some of the cavities that are filled with oil and see what turns up. Cover you nozzle with a large rag or you'll have oil everywhere.