I have a 1975 williams Toledo 2 player pinball machine. When i push the replay button it goes into reset the machine starts resetting. The scores reset but the bonus unit does not reset and go down to 0. So in turn the ball does not kick out into shooter lane. I can push the ball out into the shooter lane manually and everything works perfect until the ball drains. It does not recognize the ball drained. I have a schematic for the machine but something was spilled on it at sometime and it can not be read. Any help would be great. Thanks