Quoted from Eskaybee:Yes, reseat the connectors to the ball trough under the pf where the balls shoot into the shooter lane. It happened to my ST about 2-3 times in the 2+ years I owned it.
Reseat. If it comes back. Reflow the solder on the optos and pins the connector plugs onto. On the two small ball trough opto boards.
LTG : )