Do your VCG and OFHG then use a degreaser and clean the block. This will make it easier to spot leaks after. If your oil pan gasket is leaking (highly doubt it) it's a real pain to replace it. To drop the oil pan you have to drop the entire front subframe and support the engine from the top.
If you do have to remove the oil pan, I strongly suggest welding or safety wiring your oil pump nut to the sprocket. The nut tends to back off if your engine regularly sees sustained 6k+ rpm, which causes a complete loss of oil pressure and your engine becomes a boat anchor.