Hi, I just got a hot tip em too free off craigslist, I just had to drive 3 1/2 hours to get it. I've made some fixing post about it recently too. Today I found out it had some bad & broken contact on the drop down targets so I ordered some tonight. Does yours lite up for the 10,000 bonus when you first turn it on ? I tried to make the bonus unit go to 0 but it wanted to start with 10,000. Not related but Something I learned on it today was. I noticed the 10,000 point relay was on & I had the playfield tilted up & the ball that rolls up that chute on the right was just touching the target & thats what it's supposed to do. So if your working on your game remove that ball that stays on the playfield.
p.s thanks to your picture above I didn't know there was a bulb in the center bumper ok now loose bulb.