Help Its Bleading

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i have a 97 d16y7 it is a manual with 100k on it it is leaking oil from either the main seal next to the trans or the pan. Is there a comon place on these engines that leak and is there a way to trace it down? Also the brace or somethink of that nature on the bottom below the fly wheel bolted to the block and to the bellhousing it has 4 bolts in it 2 12mm and 2 14mm can this be removed to take the pan off and change the pan gasket or se if the leak can be detected by eye thanks any help would be great