Working on a friend's GS and down to the last problem: V, which I believe should be releasing after the first ball is released into the shooting lane, isn't and the ball count does not decrement when it drains. It will release VERY occasionally, but it usually takes anywhere from 1-5 balls before it does. Once it does release everything works as it should. It also does not matter what ball I start the game on, ie-3,4,5,6. I replaced the sw. under the apron today (not the trough sw. which is working fine b/c the ball always gets returned) but no difference. All sw. involved are clean and making solid contact.