2001 burb oil leak. help!

[meter swinger]

Hey fellas,
Never posted on this side before, im usually on the 55-59 or 73-87 areas. Got a question about my wifes 01 burb,(5.3) this sucker has been leaking oil for about 6mths. It leaks out the rear of the block. Im thinkin maybe a sensor back there somewhere? I used the search on the board but nothing useful comes up. Help! Im just a dumb ol 1st gen small block guy im thinking if i gotta pay to get this engine pulled to replace gaskets its gonna be $$$$.
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