I finally got a resolution with the inoperative up/down post. It turned out to be a faulty pre-driver that is for that coil on the driver board. The post is now working perfectly and also found it actually does come up when the ball is first plunged. It seems about the only time it doesn't come up is when the right orbit light is lit, mainly cause to complete the x2, x3 etc the ball needs to complete the loop around through the left orbit to register. Also at certain times on some modes it also doesn't pop up. So happy to have it working as it should