Check the diodes on the target switches.

Found the repair logs for my Firepower when I first got it.

Discovered that if a ball is locked in left eject hole and spinner is scoring, a right flip will cause a tilt. Caused by incorrect wiring to eject hole & other switches, effectively bypassing the diodes. Also simulates a shorted diode. Someone had moved some wires around.

Notice the rectangle this makes on the matrix.

Switch Matrix Fault.jpg

Yes, row wires go to non-banded side, should never be any wires on the banded side.

Also should have mentioned that the row wires & non-banded side of diode are soldered to a floating tab that is connected to nothing, it's just a solder point. The banded side of the diode is soldered to the switch blade tab.

Congrats! The switch matrix is a finicky creature.