Im having a problem with Fireball Classic. Switches are firing the wrong coils. The left sling fires the knocker, bottom and middle pop switches fire trough coils. No power to saucer coils but that may be a seperate issue. Changed out the mpu for known good one, same issues present. Pretty decent crud/corrosion visible inside the connector j4 pin 12 nd 13, could this be contributing? Checking diodes under the playfield now. Thanks for any advice fellows.