Update
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Monday 30 April 2018 at 08:43
Okay, so here is the report.
I did that mod with the violet/green wire from the drop coil to the J108 pin 1 connector, which was firmly in place on that coil with the other two wires. I removed the aux board and tested all the transistors, none are out of range. I checked the pin 1 at J4 aux board...
Source: http://pinside.com/pinball/forum/topic/sttng-owners-club/page/46#post-4370269