I have been working on this for many attempts over a couple weeks now
The magnet occasionally drops the ball down down the playfield rather than firing the ball up to the lock. I have read another very similar thread and the switch at the bottom of the brick drop target assembly is usually the culprit. (I have taken apart the assembly and cleaned it right up).
I have adjusted this switch and tested and retested several ways and many times and I cant fault the switch.
It seems like the switch to magnet communication is off?
IF the problem is not the switch, what else could it be?