Is there any way to air test the tcc circuit on a 4l60e?

I read you can apply air into the input shaft end and stroke the pump apply valve. Is anyone able to give some detail on what I would expect to hear when the valve is stroke vs not stroked?

Also there's a hole in the case you can apply air to, if the apply valve is not stroked would air come out the input shaft end?

I've rebuilt my 4l60e and I've got no lockup, but everything else works perfectly. Ive replaced the valve body and wiring harness and all solenoids so all I can think of now is the torque converter or the pump. I've got a new torque converter but wanting to try test the pump prior to reinstalling the trans.