I just caused this and am currently troubleshooting, but thought it was a weird symptom. If the roto-target moves, my right pop bumper bulb gets much brighter. So long as the pops remain lit, that bulb will remain too bright. However, if you turn off the pops, move the roto-target, then turn the pops back on there is a small chance it will go back to normal brightness. Then as soon as you move the roto-target again, it will get too bright.
This happened after I adjusted roto-target to center them, so I figure it's probably an issue on that stepper. I can't find a single position that causes the problem (or fixes it) right now. Any quick ideas on what I might've done?
It's hard to get it back to normal. It appears to be caused by vibration even when moving by hand. If I push in the solenoid to prevent the stepper from clicking I can rotate it with no issue. It's when the small click happens that I see the problem. Trying to find something that could be triggered by such a small vibration.