You might want to go into switch test mode and, while the matrix is up, go into the backbox and check J116-J119. In the test mode, try putting pressure on these different connectors to see if anything happens and make sure all are plugged in correctly.

Did you just lose power to the optos or did you pick up this game with them not working?

This is normal activity as the ball search is activating every solenoid on the pf.

Did you try messing with the connectors I mentioned? You can also check for power right at that connector. Look at the manual (if you don't have it, you can find it on ipdb) and see what the voltage for each wire should be. Get a multimeter and set it to check DCV less than 10v (or higher if those outputs are higher). Put the black lead to ground, then take the red lead to each wire that should have voltage. If all of these give off normal voltage, then go to each individual opto and check for voltage there. If the connector has voltage and the optos do not, then you have a cut in your wire. If the connectors are not giving off the correct voltage, then you've got an issue with the connector (male or female side) or somewhere on the board, where you'll need to track it back on the schematics.