Hi. I don't have that game, but if it has set for some time, you WILL need to go completely through EVERYTHING if you hope to get it back to 100%
If that is a multi game bowler, the step units pass signals through them to other step units, even if you are not playing a particular game.
So, scoring/functionality, will be affected if they are not ALL working well together.
The same goes for the score motor, and reset bank.etc...