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@dumbass built and tested!

Includes cables!

https://pinside.com/pinball/forum/topic/dumbass-test-and-reproduction-pcbs/page/27#post-7644242

Quoted from @ChrisHibler:

"This three board system (one to provide power, one to intercept switch signals, and one to protect the special solenoid circuits) absolutely protects the special solenoid circuits in all Williams System 3-11 MPU boards and would also work for Data East "reflexive" MPU boards. No more holes burned completely through the PCB. No need for a separate fuse board.

Briefly, the way it works is by intercepting the special solenoid switch signals, detecting stuck switches, and blocking conveyance of that switch signal to the MPU. It takes literally 5 minutes to install, is completely reversible, and 100% protects special solenoids on games like FirePower, Flash, Black Knight, High Speed, Pin*Bot, etc from locking on and damaging your PCBs.

The concept is not new to pinball, but it is new to the board sets mentioned.
Gottlieb Pop Bumper Driver Boards do the same thing, albeit via non-intelligent hardware.
WPC implemented something similar in software. If a sling switch is closed 10 times in a row with no intervening switch closures, that solenoid circuit will be disabled (this may not be quite right...research underway, but you get the idea)."

OST-LGC-MTH + OST-PWR-WMS + OST-SGL-WMS

These boards operate as a set to implement "One Shot Trigger". This is a safety feature to prevent blown transistors from stuck special solenoid triggers (SST) resulting in locked on special solenoid drives (SSD). The traditional solution has been individually fused SSDs but this is not foolproof. The fuse does not always blow. This solution controls the SSD in software as a response to the SST. The SSD is pulsed rather than being a direct reflection of the SST state. The catastrophic end result of a stuck SST is ignition of the board transistor resulting in board substrate damage (the result is a hole in the board).