The left flipper on my machine is sticking up, but not all the time, and not for the same amount of time. Sometimes pushing the flipper button a couple times releases it, sometimes it's a waiting game, or till the ball drains. I have ruled out the coil and sleeve (sleeve seems to fit in the coil nicely, and the plunger doesn't drag) I think. Mechanically it moves nice and easy with the power off, and doesn't stick. It doesn't have an end of stroke switch, I think the coil is controlled by a board. It was stuck up yesterday, and I shut off the power to the machine. It instantly snapped down, that leads me to believe it's electrical. Any ideas how to fix this? I assume it's a board problem. Are there new or refurbished boards available? What is my next step to diagnosing / fixing this?