With the governor off and the valve body on you can blow air into the hole that's under the governor, this will cause the 1-2 and 2-3 shift valve to move. You might have to have to pan off to hear them.

With the valve body off you also can air check the band and air check the 1-2 and 2-3 shift valves again to see them move.

This will help you narrow it down.