Why do you need to replace the switches? They don't usually go bad unless someone filed them. Not trying to be a jerk, just trying to understand the problem.

Do you have the original targets in the game or are have they been replaced?

It is definitely a drop target switch since she said it advances bonus, pops don't advance. Drops don't have caps since they are a switch that stays closed and and don't have a short duration closure like a pop or stand up target.

Sounds like those two drop switches mentioned earlier are the culprit. They may be oxidized so they conduct unreliably. You could try cleaning them off with a scotchbrite so they are nice shiny gold, but don't go crazy because if you take the gold plating off they are worthless.