i have a Data East Jurassic Park and the left flipper and right upper work perfect everytime but the right lower will work sometimes and then others it wont go up. if you help it up it will hold . when it doesnt work, you can hear a hum and feel it humming. new EOS switch, new cabinet switch, new coil, wired correctly. no blown fuses. drives me insane. i figure it's the flipper board, maybe a bad transistor.