You might try applying some (regulated) compressed air to the crankcase and spray some soapy water on suspected areas then watch for bubbles to detect the leaks. You will need to seal off breathers, PCV inlets, etc, and keep the air pressure fairly low or else you'll do damage to other seals.

It could be blow-by and excessive crankcase pressure that pushed out a seal. Have the rings seated yet? I like to run a Pan-Evac to reduce crankcase pressure, improve ring-seal and crankcase windage.

If it is the intake, perhaps New gaskets and some sealer in the problem area will solve it, or you may need to have parts machined to correct.