CRAP! I'm smoking!

Heres how I check for a leak from the valley:
Pop the PVC out of the cover, move it aside,and plug the hole.
Pop the breather(s), and plug the hole(s).
Pull the dipstick out. Install a vacuum/pressure gauge there.

Start er up. Bring the Rs up to 1800 or so. The gauge should begin to read pressure. NOT vacuum. If theres vacuum there,you have your answer.Do not let the pressure rise above 3 or so psi. 4psi sometimes starts blowing seals or gaskets.