Quoted from smersh:
So I had a J1 connector on the Warp ramp opto board loose and intermitting. I fixed that! I also had a broken diode on the spinner micro switch so fixed that. Turned on pressed start and nothing....after a moment it started game and started going right up the warps,, skipping sounds, double scoring, extra ball, heck I think it even paid my mortgage. All that with the ball in the shooter lane. I put in test mode and went to switch test and 4 optos where blowing up the test oscillating very fast, rapidly. None of the 3 other opto boards and there four opto would register. So I shut pin off reseted every opto connector to their boards. Seems to work and play correctly now. A little nervous. lol. I did read in a forum post from a few years back that the new code made the optos more sensitive and unplugging and plugging back in was recommended.
This is a intermittent problem with mine since the week I bought it.
My fixes (after a lot of frustration)...
1. Twist the opto wire directly under the magnet. The magnetic field can interfere with the signal if it's not twisted. (Dm me and I'll explain)
2. Reseat all the opto connections on the board under the playfield. Easy. Not time consuming. Just be careful.
3. Reseat ALL the connections in the backbox. Again, carefully. Pull on them a (very) little, then push them back in snugly.
My ST pro has done exactly this numerous times.to the point where I almost sent the boards away to be resoldered.
Good luck my friend.