Quoted from jetmechinnc:when scoring 10 points, when you hit 9, and than 0, it does not add to the 100 points
Inspect and diagnose this circuit with Alligator clip jumper wires, Starting with this switch on the 10 Point relay (N)
http://www.planetimming.com/Pinball/troubleshooting/EM%20Troubleshooting.pdf
http://www.pinrepair.com/em/index3.htm#features