Newbie here, I think I've run up against my first major pinball issue.
Stern "pinball" 1977 solid state, good working condition until today. Found the machine powered on, but unresponsive to anything. Reset the power switch and now experience:
Rapid continuous clicking on the solenoid driver board (as 2518 22 A3)
Steady green LED on the MPU
Holding the flipper buttons in results in continuous firing of the flipper solenoids.
I've checked all fuses, and dont see anything else out of the ordinary on any of the boards.
Any thoughts on my next troubleshooting steps?