Picked up a nice LAH today that has a few issues. A number of switches trigger the ball launch coil. At first I thought it might be a switch matrix fault, now I'm not so sure. Haven't had the time to go over the machine in any real detail yet. When in game mode the left sling switch and all the crane targets will fire the ball launch coil. They aren't in the same row or column. In switch test mode none of these switches trigger multiple switch inputs. Without looking through the manual/schematics in any real detail as yet, I'm wondering if it might be an IC common to these solenoids, prior to the drive transistors. Any thoughts or ideas on what to check first?

Thanks, as soon as I get the game setup again I'll do just that.