First thing go into switch test, and bang around the playfield. That will sort out if you have a vibration problem or something else going on. If so you have to adjust switches so they are less sensitive.

LTG : )

Then I'd start looking for shorts to switch wiring.

Basic switch matrix issues would be a switch wired wrong, diode on backwards, or a short to switch wiring.

But your game is a little different with those encased plastic stand up targets.

And I've found some of them different inside - not compatible with all Sega or Capcom games - so if any look new, you might consider them as a problem too.

LTG : )

Try hitting switches in switch test with the glass off and see if more than one says you pressed it when you press one. There may be a column or row issue. Next, you look in the book and see if the switches having issues are in the same column or row. This will tell us a lot and we can help you from there.

i just got a southpar and i saw that in the switch test mode if you scroll to draw ( on a switch that is giving you grief) it will show a drawing on the dmd with color codes for wiring and diodes and the switch.

I have a SP and when I had the game set to easy Cartman would advance after hitting Kenny while completing Cartman mode. Since I upped the difficulty the gimme has gone away. I've never had multiball trigger via the pops though.